Answer:
C. Two-tailed paired t-test.
Step-by-step explanation:
Since Dr. Hernandez takes 30 samples from a contaminated lake and 30 fish from a pristine lake, he should use a two-tailed t-test.
Paired t-tests describe tests used to compare the means of two samples when each observation in one sample can be paired with an observation in the other sample. Dr. Hernandez can certainly pair the samples and observe the differences, so the answer is C. Two-tailed paired t-test.
Hope this helps!
Which of these points lies on the line discribed by the equation below? y-4= -2(x-6)
A. (-6,-4)
B. (-4,-6)
C. (6,4)
D. (4,6)
Answer:
C, (6,4)
Step-by-step explanation:
The points (x,y) that lie on the line must fit into the equation correctly. So, we can test out the 4 options to see whether they fit correctly into the equation.
A:
y-4
= -4 -4 = -8
-2(x-6)
= -2 (-6-6)
= 24
Since -8≠24, so A is incorrect.
B:
y -4 = -6-4 = -10
-2(x-6) = -2 (-4-6) = 20
-10≠20, so B is incorrect.
C:
y-4 = 4 -4 = 0
-2(x-6) = -2(6-6) = 0
Both sides are equal. C is correct.
But lets test D out too.
y-4 = 6-4 = 2
-2(x-6) = -2(4-6) = 4
2≠4, so D is incorrect.
Which of the following values are in the range of the function graphed below? check all that apply.
A. 0
B. -4
C. 2
D. 1
E. -1
F. 4
Answer:
1
Step-by-step explanation:
The range is the output values
The only output value is y=1
The range is 1
Suppose you have two six-sided dice where each side is equally likely to land face up when rolled.
Required:
a. What is the probability that you will roll doubles?
b. What is the probability that you will roll a sum of four?
c. Are these empirical or a theoretical probabilities?
i. Empirical
ii. Theoretical
Answer:a. ii.
A. Is Theoretical because there is no real way of knowing what you will roll.
Answer:
a. 0.17
b. 0.08
c. theoretical
Step-by-step explanation:
Tublu buys a cylindrical water tank of height 1.4m and diameter 1.1m to catch rainwater off his roof. He has a full 2 litres tin of paint in his store and decides to paint the tank (not the base). If he uses 250 ml to cover 1 m2, will he have enough paint to cover the tank with one layer of paint? [take π=3.142]
Answer:
Tublu has more than enough paint to cover the tank surface in one layer coating
Step-by-step explanation:
Height of the cylinder = 1.4 m
diameter of the cylinder = 1.1 m
total volume of paint available = 2 litres
It takes 250 ml to cover 1 m^2 of the tank body
Since only the body is to be painted, we find the perimeter of the circle formed by the body of the tank.
perimeter of the circle formed by the body of the tank = [tex]\pi d[/tex]
==> 3.142 x 1.1 = 3.456 m
This perimeter, if spread out, will form a rectangle with a height of 1.4 m from the base.
The area of the rectangle that will be formed = (perimeter of the cylinder body) x ( height of the cylinder)
==> 3.456 x 1.4 = 4.838 m^2
This is the area that needs to be painted.
Converting the paint volume,
250 ml = 0.25 litres
To paint the above calculated are, we will need 4.838 x 0.25 = 1.21 litres of paint, (of course, excluding the base)
The volume of paint available = 2 litres
volume of paint needed = 1.21 litres
Tublu has more than enough paint to cover the tank surface in one layer coating
IS this table linear?? Can someone please explain???? What would the weight be if the number of weeks in the fitness program was 0???
Answer:
not linearsomewhere between 184 and 186 (maybe)Step-by-step explanation:
As you show, the weight differences are different for the same week differences, so the table is not linear. A graph (attached) can also show you the table is not linear.
__
The highest rate of weight loss shown in the table is 7 lbs in 3 weeks, or 4 2/3 pounds in 2 weeks. The lowest rate of weight loss shown in the table is 5 lbs in 3 weeks, or 3 1/3 pounds in 2 weeks. Based on the rates shown in the table, we might expect the starting weight to be between 3 1/3 and 4 2/3 pounds more than the first table value:
Week 0 weight: between 184 1/3 and 185 2/3 lbs, estimated.
_____
A "line of best fit" for the data has a y-intercept of about 185 pounds, which is the midpoint between our two estimates above.
22424+72346*823456-4
Answer:
5.9573
Step-by-step explanation:
Answer:
59573770196 -- that is the answer
Step-by-step explanation:
Mark me as brainliest
Write an expression that is divisible by 7. Use it to find two three-digit numbers numbers divisible by 7.
Answer:
7x+7 is obviously divisible by 7.
put in any value high enough and you can find the two three digit numbers.
Step-by-step explanation:
Two three-digit numbers divisible by 7 are 98 and 105.
Two three-digit numbers divisible by 7 are 98 and 105.To create an expression that is divisible by 7, we can use the property that the difference between two numbers is divisible by 7 if the numbers themselves are divisible by 7.
Let's represent a three-digit number divisible by 7 as "7k" where k is an integer. To find two three-digit numbers divisible by 7, we can use the following expression:
7k - 7
For example, if we substitute k = 15, we get:
7(15) - 7 = 105 - 7 = 98
So, the first three-digit number divisible by 7 is 98.
Similarly, for the second three-digit number, let's substitute k = 16:
7(16) - 7 = 112 - 7 = 105
Therefore, the two three-digit numbers divisible by 7 are 98 and 105.
To know more about divisible, refer here:
https://brainly.com/question/5372121
#SPJ2
A rectangular park is 8 miles long and 6 miles wide. How long is a pedestrian route that runs diagonally across the park?
Hey there! :)
Answer:
10 miles.
Step-by-step explanation:
To solve for the diagonal side, we can simply visualize the sides of the rectangle as sides of a right triangle with the diagonal being the hypotenuse.
We can use the Pythagorean Theorem (a² + b² = c²), where:
a = length of short leg
b = length of long leg
c = length of the diagonal
Solve:
c² = a² + b²
c² = 6² + 8²
c² = 36 + 64
c² = 100
c = 10 miles. This is the length of the pedestrian route.
Answer:
10 milesSolution,
Hypotenuse (h) = R
Perpendicular (p) = 8 miles
Base (b) = 6 miles
Now,
Using Pythagoras theorem:
[tex] {h}^{2} = {p}^{2} + {b}^{2} [/tex]
Plugging the values:
[tex] {r}^{2} = {(8)}^{2} + {(6)}^{2} [/tex]
Calculate:
[tex] {r}^{2} = 64 + 36[/tex]
[tex] {r}^{2} = 100[/tex]
[tex]r = \sqrt{100} [/tex]
[tex]r = 10 \: miles[/tex]
Length of route = 10 miles
Hope this helps...
Good luck on your assignment...
The figure shows eight congruent triangles made by dividing a square that has an area of 64 cm2. What is the area of ABH? A. 20 cm2 B. 16 cm2 C. 8 cm2 D. 6 cm2 E. 4 cm2
Answer:
the answer is C.
Step-by-step explanation:
64 ÷ 8 = 8
Answer:
c- 8cm squared
Step-by-step explanation:
plato
1. Growth of Functions (11 points) (1) (4 points) Determine whether each of these functions is O(x 2 ). Proof is not required but it may be good to try to justify it (a) 100x + 1000 (b) 100x 2 + 1000
Answer:
See explanation
Step-by-step explanation:
To determine whether each of these functions is [tex]O(x^2)[/tex], we apply these theorems:
A polynomial is always O(the term containing the highest power of n)Any O(x) function is always [tex]O(x^2)[/tex].(a)Given the function: f(x)=100x+1000
The highest power of n is 1.
Therefore f(x) is O(x).
Since any O(x) function is always [tex]O(x^2)[/tex], 100x+1000 is [tex]O(x^2)[/tex].
[tex](b) f(x)=100x^ 2 + 1000[/tex]
The highest power of n is 2.
Therefore the function is [tex]O(x^2)[/tex].
Answer:
i think its 2000
Step-by-step explanation:
An interior angle of a regular polygon has a measure of 108°. What type of polygon is it?
Answer:
Polygon is pentagon
Step-by-step explanation:
In a regular polygon each angle is equal.
In a regular polygon Each angle of polygon is given by (2n-4)90/n
where n is the number of sides of the polygon
given
An interior angle of a regular polygon has a measure of 108°.
(2n-4)90/n = 108
=> 180n - 360 = 108n
=> 180n-108n= 360
=> 72n = 360
=> n = 360/72 = 5
Thus, polygon has 5 sides
and we know that regular polygon which has 5 sides is called pentagon.
Thus, Polygon is pentagon
6th grade math :D help me please :)
Answer:
B
Step-by-step explanation:
In order to combine like terms, they must share the same variable. We can't combine things 9y and 3p because they contain two different variables. On the other hand, 7r and r work because there is only one. 7r and r combine to 8r+2
The Nutty Professor sells cashes for $6.00 per pound and Brazil nuts for $5.30 per pound. How much of
each type should be used to make a 35 pound mixture that sells for $5.64 per pound?
Answer:
17 pound of cashew and 18 pound of Brazil nutsStep-by-step explanation:
Let X be the amount of cashews that the nutty professor will mix.
Since, the total weight of the nuts should be 35 lbs
The amount of Brazil nuts = 35 - X
Now,
[tex]6x + 5.30(35 - x) = 5.64(35)[/tex]
[tex]600x + 530(35 - x) = 564 \times 35[/tex]
[tex]600x + 18550 - 530x = 19740[/tex]
[tex]70x = 19740 - 18550[/tex]
[tex]70x = 1190[/tex]
[tex]x = \frac{1190}{70} [/tex]
[tex]x = 17[/tex]
Again,
[tex] 35 - x[/tex]
[tex]35 - 17[/tex]
[tex]18[/tex]
17 pounds of cashew and 18 pounds of Brazil nuts.
Hope this helps...
Good luck on your assignment...
Find all solutions of the given system of equations and check your answer graphically. HINT [See Examples 2–5.] (If there is no solution, enter NO SOLUTION. If the system is dependent, express your answer in terms of x, where y = y(x).) 3x + 2y = 20 2x + 3y = 20 (x, y) = (No Response)
Answer:
( x, y ) = ( -20, 20 )
Step-by-step explanation:
Given data
Y = y(x)
3x + 2y = 20 ---------- equation 1
2x + 3y = 20 ---------- equation 2
find (x, y )
solving equation 1 and equation 2
3x + 2y = 20 * 2 = 6x + 2y = 40 --------- EQUATION 3
2x + 3y = 20 * 3 = 6x + 3y = 60 --------- EQUATION 4
cancelling out ( x )
Add both equation 3 and equation 4
5y = 100. hence y = 100/5 = 20
back to equation equation 2
2x + 3(20) = 20
2x = - 40
x = -20
attached is the graph to check the answer
The Westwood Warriors basketball team wants to score more points. To get better at scoring points the team is trying to improve its offensive strategies. Some opponents primarily use a zone defense, while others primarily use a man-to-man defense. When the Warriors play against teams that use a zone defense they score an average of 67 points per game with a standard deviation of 8 points per game. When they used a new offensive strategy against this defense, they scored 77 points. What is the Z-score of this value
Answer:
It is better for the warriors to use man-to-man defense.
Step-by-step explanation:
The complete question is: The Westwood Warriors basketball team wants to score more points. To get better at scoring points the team is trying to improve its offensive strategies. Some opponents primarily use a zone defense, while others primarily use a man-to-man defense. When the Warriors play against teams that use a zone defense they score an average of 67 points per game with a standard deviation of 8 points per game. When they play against teams that use a man-to-man defense they score an average of 62 points per game with a standard deviation of 5 points per game.
Since the Warriors started using their improved offensive strategies they have played two games with the following results.
Against the McNeil Mavericks
Maverick defense: zone
Warrior points: 77
Against the Round Rock Dragons
Dragon defense: man-to-man
Warrior points: 71
What is the Z-score of these values?
We are given that when the Warriors play against teams that use a zone defense they score an average of 67 points per game with a standard deviation of 8 points per game. When they play against teams that use a man-to-man defense they score an average of 62 points per game with a standard deviation of 5 points per game.
We have to find the z-scores.
Finding the z-score for the zone defense;Let X = points score by warriors when they use zone defense
The z-score probability distribution for the normal distribution is given by;
Z = [tex]\frac{X-\mu}{\sigma}[/tex] ~ N(0,1)
where, [tex]\mu[/tex] = mean score = 67 points
[tex]\sigma[/tex] = standard deviation = 8 points
It is stated that the Warriors scored 77 points when they used zone defense, so;
z-score for 77 = [tex]\frac{X-\mu}{\sigma}[/tex]
= [tex]\frac{77-67}{8}[/tex] = 1.25
Finding the z-score for the zone defense;Let X = points score by warriors when they use man-to-man defense
The z-score probability distribution for the normal distribution is given by;
Z = [tex]\frac{X-\mu}{\sigma}[/tex] ~ N(0,1)
where, [tex]\mu[/tex] = mean score = 62 points
[tex]\sigma[/tex] = standard deviation = 5 points
It is stated that the Warriors scored 71 points when they used man-to-man defense, so;
z-score for 71 = [tex]\frac{X-\mu}{\sigma}[/tex]
= [tex]\frac{71-62}{5}[/tex] = 1.8
So, it is better for the warriors to use man-to-man defense.
A market research company conducted a survey to find the level of affluence in a city. They defined the category "affluence" for people earning $100,000 or more annually. Out of 267 persons who replied to their survey, 32 are considered affluent. What is the 95% confidence interval for this population proportion? Answer choices are rounded to the hundredths place
Answer:
A 95% confidence interval for this population proportion is [0.081, 0.159].
Step-by-step explanation:
We are given that a market research company conducted a survey to find the level of affluence in a city.
Out of 267 persons who replied to their survey, 32 are considered affluent.
Firstly, the pivotal quantity for finding the confidence interval for the population proportion is given by;
P.Q. = [tex]\frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] ~ N(0,1)
where, [tex]\hat p[/tex] = sample proportion of people who are considered affluent = [tex]\frac{32}{267}[/tex] = 0.12
n = sample of persons = 267
p = population proportion
Here for constructing a 95% confidence interval we have used One-sample z-test for proportions.
So, 95% confidence interval for the population proportion, p is ;
P(-1.96 < N(0,1) < 1.96) = 0.95 {As the critical value of z at 2.5% level
of significance are -1.96 & 1.96}
P(-1.96 < [tex]\frac{\hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] < 1.96) = 0.95
P( [tex]-1.96 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] < [tex]{\hat p-p}[/tex] < [tex]1.96 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] ) = 0.95
P( [tex]\hat p-1.96 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] < p < [tex]\hat p+1.96 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] ) = 0.95
95% confidence interval for p = [ [tex]\hat p-1.96 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] , [tex]\hat p+1.96 \times {\sqrt{\frac{\hat p(1-\hat p)}{n} } }[/tex] ]
= [ [tex]0.12-1.96 \times {\sqrt{\frac{0.12(1-0.12)}{267} } }[/tex] , [tex]0.12+1.96 \times {\sqrt{\frac{0.12(1-0.12)}{267} } }[/tex] ]
= [0.081, 0.159]
Therefore, a 95% confidence interval for this population proportion is [0.081, 0.159].
Answer:
0.08 to 0.16
Step-by-step explanation:
The product of an irrational number and a rational number is irrational. Sometimes True Always True Never True
Answer:
Always true
Step-by-step explanation:
If you can't express the number as a ratio of integers, multiplying or dividing it by integers will not make it so you can.
If π is irrational, 2π is also irrational.
It is always true that the product of a rational and an irrational number is irrational.
Answer:
all ways true
Step-by-step explanation:
Find the number if: It is 3/11 of 35/9?
Answer:
1²/33
Step-by-step explanation:
3/11×35/9
=35/33
=1²/33
Fractions are written as a ratio of two integers. The simplified form of the expression is 35/33
Division of fractionsFractions are written as a ratio of two integers. Given the expression below;
3/11 of 35/9
Of means multiplication, hence;
3/11 of 35/9 = 3/11 * 35/9
Take the product
3/11 * 35/9 = 105/99
Divide through by 3
105/99 = 35/33
Hence the simplified form of the expression is 35/33
Learn more on product here: https://brainly.com/question/10873737
#SPJ6
3(0.7z+2.8)=7(1.5z+7.2)
Answer:
z = -5
Step-by-step explanation:
3(0.7z + 2.8) = 7(1.5z + 7.2)
2.1z + 8.4 = 10.5z + 50.4
2.1z - 10.5z = 50.4 - 8.4
-8.4z = 42
z = 42/(-8.4)
z = -5
A cinema can hold 270 people at one performance 5/9 of the seats were occupied of the occupied seats 40% we occupied by concessionary ticket holders
Question:
A cinema can hold 270 people at one performance 5/9 of the seats were occupied of the occupied seats 40% we occupied by concessionary ticket holders.
What is the number of seats occupied by concessionary ticket holders?.
Answer:
60 seats
Step-by-step explanation:
Given
Number of seats = 270
Occupied Seats = 5/9
Concessionary ticket holders = 40% of occupied Seats
Required
The number of seats occupied by concessionary ticket holders
First the number of occupied seat has to be calculated.
[tex]Occupied\ Seats = \frac{5}{9} * 270[/tex]
[tex]Occupied\ Seats = \frac{1350}{9}[/tex]
[tex]Occupied\ Seats = 150[/tex]
Next is to determine the number of seats occupied by concessionary ticket holders.
[tex]Number = 40\%\ of\ occupied\ seats[/tex]
[tex]Number = 40\%\ of\ 150[/tex]
Convert percentage to decimal
[tex]Number = 0.4 * 150[/tex]
[tex]Number = 60[/tex]
Hence, 60 seats were occupied by concessionary ticket holders.
The trip is 375 miles and the train usually travels at a speed of 230mph. How long will it take them to travel.
Answer:
97.5 minutes or 1.63 hours
Step-by-step explanation:
1. Find the amount of time it takes to travel 1 mile
[tex]\frac{60}{230}[/tex] = 0.26 minutes
2. Multiply the distance by the time it takes to travel 1 mile
375 · 0.26 = 97.5 minutes
To convert to hours, divide by 60 because there are 60 minutes in 1 hour.
97.5 ÷ 60 = 1.63 hours
g a) What are some of the distinguishing properties of a normal Distribution? Discuss b) The sampling distribution of the sample means is the curve that describes how the sample means are distributed. True or False Explain c) The mean of sample means is the same as the population for a given sample of size n. True False Explain
Answer:
a) Check Explanation.
b) True. Check Explanation.
c) True. Check Explanation.
Step-by-step explanation:
a) A normal distribution is one which is characterized by four major properties.
- A normal distribution is symmetrical about the center of the distribution. That is, the variables spread out from the center in both directions in the same manner; the right side of the distribution is a mirror image of the left side of the distribution.
The center of a normal distribution is located at its peak, and 50% of the data lies above the mean, while 50% lies below.
- The mean, median and the mode are coincidental. The mean, median and mode of a normal distribution are all the same value.
- A normal distribution is unimodal, that is, has only one mode.
- The ends of the probability curve of a normal distribution never touch the x-axis, hence, it is said too be asymptotic.
b) The sampling distribution of sample means arises when random samples are drawn from the population distribution and their respective means are computed and put together to form a distribution. Hence, the curve of this sampling distribition of sample means will show how the sample means are distributed. Hence, this statement is true.
c) The Central Limit Theorem gives that if the samples are drawn randomly from a normal distribution and each sample size is considerable enough, the mean of the sampling distribution of sample means is approximately equal to the population mean. So, if the conditions stated are satisfied, then thos statement too, is true.
Hope this Helps!!!
Which of the following equation is equivalent toY=2x+3? A. Y - 3 = 2(x-1) B. Y - 2x=3 C. Y - 3 = 2(x+1) D. Y + 2x = 3
Answer:
the answer is b
Step-by-step explanation:
If x = 2, then 2x = 4
Answer:
4 = 4
Step-by-step explanation:
=> 2x = 4
Putting x = 2
=> 2(2) = 4
=> 4 = 4
Answer:
TrueSolution,
X= 2
Now,
2x=4
plugging the value of X,
2*2= 4
4 = 4 ( hence it is true)
Need help plz someone help me solved this problem! I will mark you as brainiest !
Answer:
see explanation
Step-by-step explanation:
Given
f(x) = 60 × [tex]16^{x}[/tex]
x = 1 → f(1) = 60 × 16 = 960 ← bacteria present after 1 day
x = 2 → f(2) = 60 × 16² = 15360 ← bacteria present after 2 days
x = 3 → f(3) = 60 × 16³ = 245760 ← bacteria present after 3 days
You spend 6,380.00 a year for rent. This is 22% of your income. What is your income?
Answer: 29,000.00
Step-by-step explanation:
Let the income=x. 22%=0.22.
So 6380/x=0.22
x=6380/0.22=29,000.00
The function f(x) = x^2+4 is defined over the interval (-2,2). If the interval is dived into n equal parts what is the height of the right endpoint of the kth rectangle?
Answer:
Option (A).
Step-by-step explanation:
The function f(x) = x² + 4 is defined over the interval (-2, 2)
Total number of equal parts between this interval = 5
If the interval is divided into n equal parts, height of the right endpoint of each rectangle = [tex]\frac{5}{n}[/tex]
Height of the endpoint of the k rectangles = [tex]k.\frac{5}{n}[/tex]
Therefore, height of the endpoint of the kth rectangle = Height of first rectangle + height of k rectangles
= -2 + [tex]k.\frac{5}{n}[/tex]
Option (A). will be the answer.
The height of the right endpoint of the kth rectangle h = -2 + k (5/n)
What is the height?The height is a vertical distance between two points. In the case of the triangle, the height will be the distance between the base and the top vertex of the triangle.
The function f(x) = x² + 4 is defined over the interval) (-2, 2 )
Total number of equal parts between this interval = 5
If the interval is divided into n equal parts, the height of the right endpoint of each rectangle = (5/n)
Height of the endpoint of the k rectangles = k (5/n)
The height of the endpoint of the kth rectangle:-
= Height of first rectangle + height of k rectangles
= -2 + k ( 5/n )
Therefore the height of the right endpoint of the kth rectangle h = -2 + k (5/n)
To know more about height follow
https://brainly.com/question/1739912
#SPJ5
Find the value of s(t(-3)):
s(x) = - 3x-2
t(x) = 5x - 4
Please helppp!
Answer:
(-3x-2/x) multiply by (-15x+12/x) so It's (A)
Hope this helped you!!
Step-by-step explanation:
Please help with this
Answer:
C) 42
Step-by-step explanation:
The parallel lines divide the transversals proportionally.
x/35 = 30/25
x = 35(6/5) . . . . multiply by 35, reduce the fraction
x = 42
While starting salaries have fallen for college graduates in many of the top hiring fields, there is some good news for business undergraduates with concentrations in accounting and finance (Bloomberg Businessweek, July 1, 2010). According to the National Association of Colleges and Employers’ Summer 2010 Salary Survey, accounting graduates commanded the second highest salary at $50,402, followed by finance graduates at $49,703. Let the standard deviation for accounting and finance graduates be $6,000 and $10,000, respectively.
a. What is the probability that 100 randomly selected accounting graduates will average more than $52,000 in salary?
b. What is the probability that 100 randomly selected finance graduates will average more than $52,000 in salary?
c. Comment on the above probabilities.
Answer:
Step-by-step explanation:
According to the central limit theorem, if independent random samples of size n are repeatedly taken from any population and n is large, the distribution of the sample means will approach a normal distribution. The size of n should be greater than or equal to 30. Given n = 100 for both scenarios, we would apply the formula,
z = (x - µ)/(σ/√n)
a) x is a random variable representing the salaries of accounting graduates. We want to determine P( x > 52000)
From the information given
µ = 50402
σ = 6000
z = (52000 - 50402)/(6000/√100) = 2.66
Looking at the normal distribution table, the probability corresponding to the z score is 0.9961
b) x is a random variable representing the salaries of finance graduates. We want to determine P(x > 52000)
From the information given
µ = 49703
σ = 10000
z = (52000 - 49703)/(10000/√100) = 2.3
Looking at the normal distribution table, the probability corresponding to the z score is 0.9893
c) The probabilities of either jobs paying that amount is high and very close.