The fundamental regression assumption that the error terms are independent of one another is broken when substantial autocorrelation is shown following the estimation of a regression model. Here option C is the correct answer.
The two error factors must be somewhat co-correlated in order for there to be autocorrelation. Having it indicates that the correlation between the two error factors is not equal to zero. It goes against the fundamental tenet of the traditional linear regression approach.
Autocorrelation measures the relationship between a variable's current value and its historical values. A perfect positive correlation is represented by an autocorrelation of 1, whereas a perfect negative correlation is represented by an autocorrelation of 1.
An explanation of how one or more independent variables relate to the target variable, response variable, or dependent variable that the regression model predicts.
Complete question:
When severe autocorrelation is indicated after a regression model has been estimated, which underlying regression assumption is violated? A - The dispersion of population data points around the population regression line remains constant everywhere along the line
B - The population of values is normally distributed about the population regression line.
C - Heteroscedasticity
D - The error terms are independent of each other.
E - A linear relationship exists between X and Y in the population
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Here is an equation.
y = 3x + 5
a) When x = 10, what is the value of y?
b) When x = -10, what is the value of y?
Answer:
a) y = 35b) y = -25Step-by-step explanation:
Given equation,
→ y = 3x + 5
The value of y when x is 10,
→ y = 3x + 5
→ y = 3(10) + 5
→ y = 30 + 5
→ [ y = 35 ]
The value of y when x is -10,
→ y = 3x + 5
→ y = 3(-10) + 5
→ y = (-30) + 5
→ [ y = -25 ]
So, these are the values of y.
do you know how to do this my niece is struggling?
The deli ell 3 time a many tuna andwiche in one month a roat beef. How many more tuna andwiche were old than roat beef I’m 5 month? Explain
More than twice as many roast beef sandwiches as the deli sold over the course of five months.
Explain the term thrice of the number?Three times, such as a series; three times or in three different ways. in a threefold amount or level.Let the tuna sandwich sold by deli be 'x'
Then, tuna sandwich for 5 months-
1st month - x1
2nd month - x2
3rd month - x3
4th month - x4
5th month - x5
Then,
Selling of roast beef sandwich is 3 times more than tuna sandwich.
Then, roast beef sandwich for 5 months-
1st month -3x1
2nd month - 3x2
3rd month -3x3
4th month - 3x4
5th month - 3x5
Thus, the difference is-
Difference = (3x5 + 3x4 + 3x3 + 3x2 + 3x1) - (x1 + x2 + x3 + x4 + x5)
Difference = 2x1 + 2x2 + 2x3 + 2x4 + 2x5
Thus, more than twice as many roast beef sandwiches as the deli sold over the course of five months.
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Answer:
Step-by-step explanation:
for a study with 4 groups, how many independent research questions can be asked? this is the same as the maximum number of planned research questions recommended in your book.
In a book, a study of analysis with four groups is recommended to include a maximum of four prepared research topics.
These projects give you and your students the chance to research watershed-related subjects outside of the regular chemical water testing every three weeks. They give your pupils the chance to hone their research and scientific method skills, examine issues related to waterways that interest them, and analyze data and solve problems. For a study with four groups, a book can only prescribe a maximum of four planned research topics.
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suppose that a coin is tossed three times and the side showing face up on each toss is noted. suppose also that on each toss heads and tails are equally likely. let hht indicate the outcome heads on the first two tosses and tails on the third, tht the outcome tails on the first and third tosses and heads on the second, and so forth. (a) use set-roster notation to describe the elements in the sample space whose outcomes are all the possible head-tail sequences obtained in the three tosses. (b) Write each of the following events as a set, in set-roster notation, and find its probability. (i) The event that exactly one toss results in a head. set probability (ii) The event that at least two tosses result in a head. set probability (ii) The event that no head is obtained. set probability
a) SS = {HHH, THH, HTH, HHT, THT, TTH, HTT, TTT} i) P(1 head) = 0.375 ii) P(at least 2 heads) = 0.5 iii) P(no heads) = 0.125.
Suppose that a coin is tossed three times and the side showing face up on each toss is noted. Suppose also that on each toss heads and tails are equally likely. Let HHT indicate the outcome heads on the first two tosses and tails on the third, THT the outcome tails on the first and third tosses and heads on the second, and so forth.
Given that
a) A coin is tossed three times and the side showing face up on each toss is noted.
The total number of possible outcome are 2³ = 8
The sample space is given by
SS = {HHH, THH, HTH, HHT, THT, TTH, HTT, TTT}
b) Write each of the following events as a set, in set-roster notation, and find its probability.
(i)The event that exactly one toss results in a head.
In this case we need to include only those outcomes where we have exactly on head,
E(1 head) = {THT, TTH, HTT}
So there are 3 such outcomes, the probability is
P(1 head) = no. of desired outcomes/total number of outcomes
P(1 head) = 3/8
P(1 head) = 0.375
(ii) The event that at least two tosses result in a head
In this case we need to include only those outcomes where we have at least two heads which means two or greater than two,
E(at least 2 heads) = {HHH, THH, HTH, HHT}
So there are 4 such outcomes, the probability is
P(at least 2 heads) = 4/8
P(at least 2 heads) = 0.5
(iii) The event that no head is obtained.
In this case we need to include only those outcomes where we have no heads at all.
E(no heads) = {TTT}
So there is only 1 such outcome, the probability is
P(no heads) = 1/8
P(no heads) = 0.125
Hence the answer is a) SS = {HHH, THH, HTH, HHT, THT, TTH, HTT, TTT} i) P(1 head) = 0.375 ii) P(at least 2 heads) = 0.5 iii) P(no heads) = 0.125.
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Brandon went to the store to buy some walnuts. The price per pound of the walnuts is $6.50 per pound and he has a coupon for $3.75 off the final amount. With the coupon, how much would Brandon have to pay to buy 5 pounds of walnuts? Also, write an expression for the cost to buy
p
p pounds of walnuts, assuming at least one pound is purchased.
Yes. Yes I know. It’s stuff from years ago. My teacher is making me do this review thing and I don’t remember anything past a week ago.
how many four-digit numbers greater than 2999 can be formed such that the product of the middle two digits exceeds 5?
The 3360 possible four-digit numbers are greater than 2999.
What is the combination?
A combination in mathematics is a choice made from a group of separate elements where the order of the selection is irrelevant.
We know it has to be a four-digit number,
The first digit has to be between 3 and 9 (inclusive) so there are 7 options.
The unit digit can be any number so there are 10 options.
The answer will be 7 * (# of possible middle digit combos) * 10.
There are 7*48*10 = 3360 possible four-digit numbers.
Hence, the 3360 possible four-digit numbers are greater than 2999.
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A new health drink has 170% of the recommended daily allowance (RDA) for a certain vitamin. The RDA for this vitamin is 50 mg. How many milligrams of the vitamin are in the drink?
An electric cooter company charge 1 to rent a cooter plu an additional 0. 15 per minute the cooter i rented. Which expreion repreent the cot, in dollar, for renting a cooter for m minute
Since the scooter is rented for $1 and the firm charges $0.15 per minute, the necessary expression is 1+0.15m.
What is expression?An expression, often known as a mathematical expression, is a finite collection of symbols that are well-formed in accordance with context-dependent principles. Mathematical expressions consist of at least two numbers or variables, at least one arithmetic operation, and a statement. It's possible to multiply, divide, add, or subtract with this mathematical operation. An expression's structure is as follows: (Number/variable, Math Operator, Number/variable) is an expression.
Here,
rent of scooter=$1
rent of scooter per minute=$0.15
The expression,
=1+0.15m
The required expression is 1+0.15m as rent of scooter is $1 and per minute rent charged by company is $0.15.
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The population of city A is 23.5% of city B and the population of city B is 51% of city C. If city C has 9.89 million people, which of the following is the closest approximation of city A's population in millions?
0.95 million
1.2 million
1.25 million
1.3 million
1.42 million
The required closest approximation of city A's population is 1.185 million.
What is percent?Percentages are basically divisions where the denominator is 100. To show that a number is a percent, we utilize the percent image (%) close to the number. For instance, on the off chance that you got 75 inquiries right out of 100 on a test (75/100), you would have scored 75%.
According to question:We have, city A is 23.5% of city B
A/B = 235/1000 = 47/200 = (B)47/200-----------(1)
and, city B is 51% of city C.
B/C = 51/100
B = (51/100)×9.89 = 5.0439 million
As C = 9.89 million
Put the value of c in equation (1)
A = (5.0439)47/200 = 1.185 million
Thus, required population of city A is 1.185 million.
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Each bag of cereal should contain 350 grams. a box was selected at ramdon and weighed 342 grams. what is the percent error?
The percentage error in selecting the random box is 2.285 %
Let the total amount of bag of cereal be = 350 grams
The box selected at random had a weight of = 342 grams
We know the formula of percentage error.
The percentage error is calculated by the formula
Percentage Error =
( ( Original Value - Observed Value ) / Original Value ) x 100
Plug the values in above formula:
Percentage Error = ( ( 350 - 342 ) / 350 ) x 100
= ( 8 / 350 ) x 100
= 0.02285 x 100
= 2.285 %
Hence , The percentage error in selecting the random box is 2.285 %
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The floor of a rectangular living room is 12 meters by 5 meters. What is the distance between opposite corners of the living room?
Answer: I dunno
Step-by-step explanation:
Answer: 13
Step-by-step explanation: Solve this problem by. using the Pythagorean Theorem
[tex]12^{2} + 5^{2} = \sqrt[2]{C}[/tex]
144 + 25 = 169
[tex]\sqrt[2]{169}[/tex] = 13
THe Hypotenuse or distance between the triangle diagonals is 13.
write a formula for f, the specific antiderivative of f. (remember to use absolute values where appropriate.) f(u)
The antiderivative of a function f will be the integral of differentiated value of the function i.e. the function itself.
What is Antiderivative of a function?
A function is said to be antiderivative if its derivative equals the original function. The antiderivative function is the same as an indefinite integral. The limit of a sum of terms f (x) x in the limit that approaches zero, where is the integrand function, is known as a definite integral.
Considering a function f(x) = Sin x
dy/dx = Cos x
Now, the integral of Cos x would be known as Anti derivative.
here, ∫ Cos x = Sin x
thus, Anti derivative of Cos x is equal to the function itself.
hence, proved.
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A circle is centered on point BBB. Points AAA, CCC and DDD lie on its circumference. If \blue{\angle ABC}∠ABCstart color #6495ed, angle, A, B, C, end color #6495ed measures 40^\circ40 ∘ 40, degrees, what does \orange{\angle ADC}∠ADCstart color #ffa500, angle, A, D, C, end color #ffa500 measure?
Answer:
122°
The measure of the central angle is twice the measure of the inscribed angle that subtends the same arc.
∠ABC = 2×∠ADC = 2×61°
∠ABC = 122°
Step-by-step explanation:
41. which is not a type of comparison for which you would anticipate a two-sample test? a) before treatment versus after treatment. b) old method versus new method. c) sample mean versus desired mean. d) experimental group versus control group.
The sample mean versus desired mean is not a type of comparison one would anticipate for a two-sample test to be performed. Therefore, the option C holds true.
A sample test can be referred to or considered as the test that includes the conducting of an activity to determine the nearest possible outcome of a much larger set of observations. The purpose of conducting such a test is testing that two population means are the same in a set of observations. If the means are same, it means that the test is successful.
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Michael is 333 times as old as brandon. 181818 years ago, michael was 999 times as old as brandon. How old is brandon now?.
Bradon is 24 years old and Micheal is 72 years old.
Michael is 3 times as old as brandon. 18 years ago, michael was 9 times as old as brandon
Let m represent Michael
Let b represent Brandon
Then,
m = 3b <-----------"Michael is 3 times as old as Brandon."
m - 18 = 9(b - 18) <-----------"18 years ago, Michael was 9 times as old as Brandon."
3b - 18 = 9b - 162
-18 = 6b - 162
144 = 6b
b = 24 <-------This is Brandon's age.
3b = m
3(24) = 72 <------This is Michael's age.
Therefore, Michael is 3 times as old as Brandon. Also, 18 years ago, Brandon would have been 6 and Michael would have been 54
Now, Bradon is 24 years old and Micheal is 72 years old.
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Which on blue, light blue yellow or red?
Step-by-step explanation:
of course there is an explanation. and a correct answer (not just a wild guess).
f(x) = 2x
g(x) = 2x² - 1
f(g(x)) means that x is first processed by g, and then the result of that is processed by f.
in other words, the whole functional expression of g becomes the input argument for f.
therefore,
f(g(x) = 2(2x² - 1) = 4x² - 2
so, the correct answer is light blue.
what is the relative humidity of the parcel at sea level on the leeward side? (fill in only the letter: a, b, c, or d, all caps) a) 25%, b) 33%, c) 100%, or d) 58%
The relative humidity of the parcel at sea level on the leeward side is 58% that is option D
The amount of water vapour in an air-water mixture relative to the maximum amount is known as relative humidity (RH). RH is a comparison between the humidity of a specific water-air mixture and the saturation humidity ratio at a particular temperature (dry-bulb)
By deducting the temperature on the wet-bulb thermometer from the temperature on the dry-bulb thermometer and utilizing a relative humidity chart, one may determine the relative humidity.
The relative humidity of the parcel at sea level on the leeward side is 58%
Option d is the correct answer
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Circle A has center of (−2, −1) and a radius of 2, and circle B has a center of (1, 2) and a radius of 4. What steps will help show that circle A is similar to circle B? Group of answer choices Translate circle A using the rule (x − 3, y − 3) Rotate circle A 180° about the origin Reflect circle A over the line y = x Dilate circle A by a scale factor of 2
Circle A will be enlarged by a scale factor of 2 to assist demonstrate how circle A and circle B are comparable.
What is a circle?It is described as a set of points, where each point is at the same distance from a fixed point (called the center of a circle).
The equation of a circle with the center and radius r
( x − a )² + ( y − b )² = r²
The equation of circle A,
(x-(-2))²+(y-(-1))²=2²
x²+4+4x
The equation of circle B,
(x-1)²+(y-2)²=4²
Thus, circle A will be enlarged by a scale factor of 2 to assist demonstrate how circle A and circle B are comparable.
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A lake fishing map is laid out on a coordinate plane with each unit equal to 1 mile. The boat is launched from the point (-5, 0) and goes to point (-5, 5) to fish. From
there, the boat travels to (0, 0) to fish and then goes back to the launch point
Determine the total number of miles traveled. Round to the nearest whole number.
05 miles
07 miles
O17 miles
O50 miles
The total number of miles traveled is given by the following option:
17 miles.
How to obtain the total distance?The total distance is divided into three parts, obtained as follows:
First part: From point (-5,0) to point (-5,5).Second part: From point (-5,5) to point (0,0).Third part: From point (0,0) back to the launch point of (-5,0).The generic notation of two points is given as follows:
[tex](x_1,y_1), (x_2,y_2)[/tex]
The distance between two points is then given by the equation presented as follows:
[tex]D = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]
Hence each distance in this problem is given as follows:
First part: 5 miles.Second part: 7 miles.Third part: 5 miles.The total distance is the sum of each distance, hence it is given as follows:
5 miles + 7 miles + 5 miles = 17 miles.
Hence the third option is correct.
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a sample of difference scores has a mean of 5 with a variance of 100. if effect size is measured using cohen’s d, what is the value of d?
The value of d is 0.05.
What is cohen?
A standardized effect size called Cohen's d is used to compare the means of two groups. It's frequently applied when contrasting a treatment with a control group. It may be an acceptable effect size to include with the findings of the t-test and the ANOVA. Cohens d is often used in psychology.
Here, we have
Given
Mean = 5
Standard deviation = 100
We have to find the value of d
So, we apply here formula for d
Cohen d = mean / standard deviation ........................1
Now, we put the value of mean and standard deviation and we get
Cohen d = 5 / 100
Cohen d = 0.05
Hence, the value of d is 0.05
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the daily scrum is an event that happens every day. what would be three concerns if the frequency were to be lowered to every two or three days
Three problems would arise if the frequency of scrum was lowered to every two or three days.
(A) There may be missed opportunities to examine and amend the sprint backlog.
(B) The Sprint strategy deteriorates; barriers are raised and taken down more slowly.
(C) Too much time is spent updating the scrum board prior to meetings.
What is a scrum?
Scrum is a project management framework that was initially focused on software development, while it has now been applied to other areas such as research, sales, marketing, and cutting-edge technology.
It is intended for groups with ten or fewer members who divide their work into tasks that can be finished in sprints, which are time-boxed iterations that can be done in as little as one month and most frequently two weeks.
If the frequency was reduced to every two or three days, there would be three issues.
(A) The chances to review and modify the Sprint Backlog may be missed.
(B) The Sprint plan becomes imprecise; obstacles are raised and removed more slowly.
(C) Too much time is spent before meetings updating the scrum board.
Therefore, three problems would arise if the frequency was lowered to every two or three days.
(A) There may be missed opportunities to examine and amend the sprint backlog.
(B) The Sprint strategy deteriorates; barriers are raised and taken down more slowly.
(C) Too much time is spent updating the scrum board prior to meetings.
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There are two sets of rainfall data for two different time periods in the same location. Period 1: 2. 3, 2. 1, 2. 2, 2. 2, 2. 2, 2. 1, 2. 4, 2. 5, 2. 2, 2. 0, 1. 9, 1. 9, 2. 1, 2. 2, 2. 3 period 2: 2. 3, 2. 1, 3. 3, 1. 5, 3. 6, 1. 6, 3. 0, 1. 1, 4. 7, 2. 1, 2. 4, 1. 9, 2. 8, 0. 5, 2. 3 what can you say about the agreement in the data sets?.
A scatter plot or scatter gram chart can highlight the distribution patterns or demonstrate and compare the two data sets.
What is scatter plot ?
Dots are used to indicate values for two separate numeric variables in a scatter plot . The values for each data point are shown by the position of each dot on the horizontal and vertical axes.
Scatter plot shows the relationships between variables are visualized using scatter plots.
The given data can highlight the distribution patterns or demonstrate two sets of rainfall data for two different time periods in the same location.
From the given data, it is observed that the given data is observed in the scatter plot.
Hence, a scatter plot or scatter gram chart can highlight the distribution patterns or demonstrate and compare the two data sets.
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the numbers 1447, 1005, and 1231 have something in common: each is a 4-digit number beginning with 1 that has exactly two identical digits. how many such numbers are there?
There can be 432 Types of Combinations for a 4-digit number beginning with 1 that has exactly two identical digits
What is permutation and combination?
The process of placing all the components of a set into a certain sequence or order is known as permutation in mathematics. In other terms, the process of permuting is the reordering of the components of a set if the set is already ordered. Nearly all areas of mathematics involve permutations in some form or another. They frequently appear when various orderings on particular finite sets are taken into account.The combination is a way of selecting items from a collection, such that (unlike permutations) the order of selection does not matter. In smaller cases, it is possible to count the number of combinations. Combination refers to the combination of n things taken k at a time without repetition. To refer to combinations in which repetition is allowed, the terms k-selection or k-combination with repetition are often used.[tex]$11xy,\qquad 1x1y,\qquad1xy1$[/tex]
Because the number must have exactly two identical number digits,[tex]$x\neq y$[/tex], [tex]$x\neq1$, and $y\neq1$[/tex]. Hence, there are [tex]$3\cdot9\cdot8=216$[/tex] number of this form.
Now suppose that the two identical digits are not 1. Reasoning similarly to before, we have the following possible combination:
[tex]$1xxy,\qquad1xyx,\qquad1yxx.$[/tex]
Again,,[tex]$x\neq y$[/tex], [tex]$x\neq1$, and $y\neq1$[/tex]. There are [tex]$3\cdot9\cdot8=216$[/tex] numbers of this form.
Thus the answer is 216+216=432
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A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 125.2-cm and a standard deviation of 2.3-cm. For shipment, 25 steel rods are bundled together.
Find the probability that the average length of a randomly selected bundle of steel rods is less than 124.5-cm.
P(M < 124.5-cm) =
Enter your answer as a number accurate to 4 decimal places. Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.
The probability that the average length of a bundle of steel rods chosen at random is less than 124.5 cm.
P(M < 124.5) = 0.0603.
P(M 169.3 cm 168.3 cm) = 0.7724
Given that,
Steel rods are produced by a firm. The lengths of the steel rods have a mean of 125.2 cm and a standard deviation of 2.3 cm, and they are regularly distributed. 25 steel rods are packaged together for shipping.
We have to determine the probability that the average length of a bundle of steel rods chosen at random is less than 124.5 cm.
P(M < 124.5-cm) =
We know that,
Mean =μ= 125.2
Standard deviation=σ=2.3
n=25
P(M<124.5)= P[(M-μ)/σ< 124.5-125.2/0.46]
=P(z<-1.522)
Using the z-table,
=0.0603
Therefore, The probability that the average length of a bundle of steel rods chosen at random is less than 124.5 cm.
P(M < 124.5) = 0.0603.
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the fracture strength of tempered glass averages 13.5 (measured in thousands of pounds per square inch) and has standard deviation 2. (a) what is the probability that the average fracture strength of 100 randomly selected pieces of this glass exceeds 13.8? (round your answer to four decimal places.)
The probability that the average fracture strength of 100 randomly selected pieces will be equal to 33.19%.
In order to find the probability first we find the Z score. The Z score related the standard deviation and the mean of any data as
Z = X - μ/σ where Z is the Z score, X is the random variable, μ is the mean and σ is the standard deviation.
The standard deviation of the randomly selected 100 variables will be given as
s = σ/√n where n = 100 and σ = 2
s = 2/√100
s = 0.2
Now, the Z score for this data will be
Z = X - μ/s where X = 13.8, and μ = 13.5 and the value of s = 0.2
Z = 13.8 - 13.5/0.2
Z = 1.5
Now, for Z = 1.5 the p value will be 0.66807
The probability will be P = 1 - 0.66807 = 0.33193 that is 33.19%
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you are analyzing a pcr run and see that one of your samples is a high positive but the internal control failed. what should you do?
Try reducing your annealing temperature by a few degrees and repeat the PCR.
What is the principle of PCR machine ?
The PCR technique is based on the enzymatic replication of DNA. In PCR, a short segment of DNA is amplified using primer mediated enzymes. DNA Polymerase synthesis new strands of DNA complementary to the template DNA.
You should try reducing your annealing temperature by a few degrees and repeat the PCR. If the problem is due to a high annealing temperature, then you should start to see something. Or, even better, if your PCR machine has a gradient functionality then perform a gradient PCR to test a variety of annealing temperatures at once.To learn more about PCR check the given link
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algebra 1
solve the system of equations without graphing. show reasoning.
please explain bc i have no clue what im doing
Answer:
(2,-1)
Step-by-step explanation:
the average hourly wage in the u.s. in october 2018 was $22.90. considering low unemployment and continued growth of the economy in 2019 it was expected that the hourly wage in october 2019 would increase. the p-value associated with the hypothesis test is .001. the correct conclusion is
The correct conclusion for "it was expected that the hourly wage in October 2019 would increase, and the p-value associated with the hypothesis test is .001" is "the average wage is not increased."
What is hypothesis?A hypothesis is described in statistics as a formal statement that explains the relationship between two or more variables belonging to the specified population. It aids the researcher in converting the stated issue into an understandable justification for the study's findings. A strong hypothesis outlines the predicted link between the dependent and independent variables and is succinct and straightforward. It is best to be as specific and testable as possible when describing this relationship.
The answer to the statement "it was predicted that the hourly wage in October 2019 would grow, and the p-value associated with the hypothesis test is.001" should be "the average wage is not raised."
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the equation of a circle is x^2+y^2=42.25
Find the radius of the circle.
Answer:
radius = 6.5
Step-by-step explanation:
the equation of a circle centred at the origin is
x² + y² = r² ( r is the radius )
x² + y² = 42.25 ← is the equation of a circle centred at the origin
with r² = 42.25 ( take square root of both sides )
r = [tex]\sqrt{42.25}[/tex] = 6.5