what is the sampling process used on dollar street? in other words, the sample of families on the dollar street page were collected using a sample that is .
The sampling process used on dollar street is stratified sampling.
Given,
Use of dollar street;
Dollar street offers a fresh perspective on families all throughout the world. Every family is arranged down a street, with the wealthiest household on the right and the lowest on the left. Each family's earnings are expressed in US dollars.
Here,
Stratified sampling;
To complete the sampling process, stratified sampling is a form of sampling technique in which the entire population is divided into smaller groups or strata.
Therefore,
Stratified sampling is used in dollar street for sampling process.
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pls help mary christmas!!
Answer:
1. 918
2. 2880
3. 2678
4. 22554
5. 66014
6. 44208
When two pipes fill a pool together, they can finish in 4 hours. If one of the pipes fills half the pool then the other takes over and finishes filling the pool, it will take them 9 hours. How long will it take each pipe to fill the pool if it were working alone?
How many hours for one pipe to fill the pool? How many hours for the other pipe to fill the pool?
One pipe takes 6 hours to fill the pool and the other takes 12 hours.
Pipe A fills 1/x of the pool per hour, and Pipe B fills 1/y of the pool per hour. In other words, A takes x hours to fill the pool and B takes y hours to fill the pool.
Together, they fill 1/x + 1/y of the pool per hour. So, 4 hours times that rate should equal 1 full pool, since together they take 4 hours to fill the pool. That gives you your first equation:
4(1/x + 1/y) = 1
You're also told that if one pipe fills half the pool and the other takes over to fill the rest, it will take 9 hours. We don't know how long Pipe A works, so call that number of hours t. Pipe B must work for 9 - t hours.
So, Pipe A, working for t hours, fills half the pool:
t(1/x) = 1/2
And Pipe B, working for 9 - t hours, fills half the pool:
(9-t)(1/y) = 1/2
You now have a system of three equations (because this is an exceptionally complicated pipe-filling-pool problem):
4(1/x + 1/y) = 1
t(1/x) = 1/2
(9-t)(1/y) = 1/2
Solve for t in that second equation, then plug it into the third equation:
t(1/x) = 1/2
t = x(1/2)
t = x/2
(9 - x/2)(1/y) = 1/2
Now you've got a system of two equations:
4(1/x + 1/y) = 1
(9 - x/2)(1/y) = 1/2
Solve for y in the second equation, then plug that into the first equation:
(9 - x/2)(1/y) = 1/2
(9 - x/2) = y(1/2)
2(9 - x/2) = y
18 - x = y (this is a really nice-looking form of that equation; we'll use it again later)
4(1/x + 1/y) = 1
4(1/x + 1/(18-x)) = 1
4/x + 4/(18-x) = 1
(4(18-x))/(x(18-x)) + (4x)/(x(18-x)) = 1
(4(18-x) + 4x)/(x(18-x)) = 1
4(18-x) + 4x = x(18-x)
72 - 4x + 4x = 18x - x2
72 = 18x - x2
x2 - 18x + 72 = 0
(x - 6)(x - 12) = 0
x - 6 = 0 OR x - 12 = 0
x = 6 OR x = 12
So, Pipe A takes either x = 6 or x = 12 hours to fill the pool alone.
When Pipe A takes 6 hours to fill the pool, Pipe B takes 12. When Pipe A takes 12 hours to fill the pool, Pipe B takes 6.
These cases are equivalent, since the original problem makes no distinction between the pipes.
Hence, one pipe takes 6 hours to fill the pool and the other takes 12 hours.
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If the area of the pentagon is 36, what is the area of the larger pentagon?
If the area of the pentagon is 36, then the area of the pentagon FGHIJ is 64.
What are Similar figures?Two figures are known as similar figures if there the corresponding angles are equal and the corresponding sider is in ratio. It is denoted by the symbol "~".
Given that the length of the side of the smaller pentagon is 12, while the length of the side of the larger pentagon is 16.
Since the two of the given figures are similar figures, therefore, we can write,
(Area of smaller pentagon)/(Area of larger pentagon) = (Ratio of the sides)²
(Area of pentagon ABCDE)/(Area of pentagon FGHIJ) = (AE / FJ)²
(36)/(Area of pentagon FGHIJ) = (12/16)²
Area of pentagon FGHIJ = 36 × (16/12)²
Area of pentagon FGHIJ = 36 × (256/144)
Area of pentagon FGHIJ = 64
Hence, the area of the pentagon FGHIJ is 64.
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after so-called play-in games, the ncaa men’s basketball tournament is a 64-team single-elimination tournament. after the teams are assigned, in how many ways can the tournament unfold? how many (base-10) digits does this number have?
This is a total of 2^32×2^16×2^8×2^4×2^2×2^1 possible outcomes that is 2^63 outcomes.
What is counting principle?The basic counting concept is a method for keeping track of all the potential outcomes in a scenario. It indicates that there are nm methods to carry out both of these activities if there are n ways to carry out one action and m ways to carry out another action after that. How selection is made based on options is determined by the Fundamental Principle of Counting. The approach of selection, taking into account all of the potential options and their combinations for calculating the probability, is made simpler by the Fundamental Principle of Counting.
Here,
Since I don't know anything about NCAA's March Madness, I'll assume that you're talking about a 64-team single-elimination tournament.
In the first round, there are 32 games, each with 2 possible outcomes. This provides for a total of 2^32 possibilities.
In the next round, there are only 16 games, again each with 2 possible outcomes, for a total of 2^16 possibilities.
You keep going, eliminating half of the players each round and taking half as long as the previous round to play the games out, until the finals, at which point there is 1 game with 2 possible outcomes.
This is a total of 2^32×2^16×2^8×2^4×2^2×2^1 possible outcomes that is 2^63 outcomes.
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PLEASE HELP ME I NEED TO ACE THIS ILL GIVE BRAINLY PLSSSSS
SS MEANS SCREENSHOT
What is the constant of proportionality in the table below?
fist ss*
Do the values in the table form a proportion? If so, what is the constant of proportionality?
second ss*
Which table shows a proportional relationship between x and y?
third ss*
The constant of proportionality of the given table is k = 2.
What are ratio and proportion?A ratio is a comparison between two similar quantities in simplest form.
Proportions are of two types one is the direct proportion in which if one quantity is increased by a constant k the other quantity will also be increased by the same constant k and vice versa.
In the case of inverse proportion if one quantity is increased by a constant k the quantity will decrease by the same constant k and vice versa.
We know the constant of proportionality between the variable x and y can be written as y = kx, where k is the constant of proportionality.
From the table when x = 2, y = 4.
∴ 4 = 2k.
k = 2.
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a page is to contain 24 square inches of print. the margins at top and bottom are 1.5 inches and 1 inch at the sides. find the most economical length (in inches) of the page.
The most economical length of the paper is 9 inches and width is 6 inches.
What is a derivative of a function?
The derivative of a function of a single variable at a chosen input value. It is the rate of change of a function with respect to a variable.
Let us consider,
Width of the printed part, in inches be 'x'
height of the printed part, in inches be 'y'
According to question,
Area of the printed part, in square inches = xy = 24
So,
y=24/x
width of the page, in inches = x + 2×1 = x+2
height of the page, in inches = y + 2×1.5 = y + 3
The area of the page (in square inches) is , A
= (x+2) (y+3)
= xy + 3x + 2y + 6
= 24 + 3x + 2y + 6
= 3x + 2y + 30
= 3x + 2×24/x + 30
= 3x + 48/x + 30
The minimum length can be found by calculating the derivative dA/dx, where A is the area of the paper
Solving the equation for dA/dx=0,
[tex] \frac{dA}{dx} = \frac{d(3x + \frac{48}{x} + 30)}{dx} [/tex]
[tex] \frac{dA}{dx} = 3 + \frac{48}{ {x}^{2} } [/tex]
[tex]\frac{dA}{dx} = 3 + \frac{48}{ {x}^{2} } = 0[/tex]
[tex]3 + \frac{48}{ {x}^{2} } = 0[/tex]
x = 4
then,
y = 24/4 = 6
The width and height of the paper are
x+2=4+2=6 and
y+3=6+3 =9
The dimensions of the page, so that the least amount of paper is used must be 6 inches wide by 9 inches tall.
Hence, the most economical length of the paper is 9 inches and the width is 6 inches.
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If company JCN made a $1196.7 million profit last year, with $798.9 million of that profit brought in by the sales department, then approximately what percent of the total profit was not brought in by the sales department?
3.3%
6.6%
20%
33%
67%
The required percent of the total profit was not brought in by the sales department is 33%.
Explain simple interest.Simple Interest (S.I.) is the strategy for working out the premium sum for a specific chief measure of cash at some pace of revenue. For instance, when an individual takes a credit of Rs. 5000, at a pace of 10 p.a. for a considerable length of time, the individual's advantage for quite some time will be S.I. on the acquired cash.
According to question:profit amount = $1196.7
Amount used in sales = $798.9
Amount was not used in sales = $1196.7 - $798.9 = $397.8
Now, then approximately percent of the total profit was not brought in by the sales department.
($397.8/$1196.7) × 100 = 33%
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in 1970, about 10 percent of the u.s. population was age 65 and older. what is the projected percentage for 2060
The projected percentage for 2060 is nearly double from 52 million in 2018 to 95 million by 2060.
Given in 1970, about 10 percent of the u.s. population was age 65 and older.
Demographic Shifts
The number of Americans ages 65 and older is projected to nearly double from 52 million in 2018 to 95 million by 2060, and the 65-and-older age group's share of the total population will rise from 16 percent to 23 percent. The older population is becoming more racially and ethnically diverse.
Hence the answer is the projected percentage for 2060 is nearly double from 52 million in 2018 to 95 million by 2060.
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Select all the equations that are equivalent to
8k = 20.
Answer: The first and the last answer choice
Step-by-step explanation:
They are equal to 8k=20 because they are the same equation but reduced or increased by the same multiple.
Answer:
it's the first option, 3rd option, and fifth option because the rest of the equation cancels out on them (ex. for the first option, divide each side by 3 that would remove the •3 from each side and leave you with 8k=20)
5.) A store pays $43 for a DVD player. The store marks up the price by 30%. What is the new price?
Answer25
Week good :
Step-by-step explanation:
the process of reasoning from a premise or premises to a conclusion based on those premises is known as
The process of reasoning from a premise or premises to a conclusion based on those premises is known as deductive reasoning.
According to the question,
We have to find the name of the process of reasoning from a premise or premises to a conclusion based on those premises.
We know that there are two types of reasoning. One is inductive reasoning and the second one is deductive reasoning.
In deductive reasoning, we make a final statement which is often called conclusion from various statements which are given. For example, if we say 25th November is my birth date and today is my birth date then the conclusion is today is 25th November.
Hence, the process of reasoning from a premise or premises to a conclusion based on those premises is known as deductive reasoning.
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In Exercise 5.18, Y1 and Y2 denoted the lengths of life, in hundreds of hours, for components of types I and II, respectively, in an electronic system. The joint density of Y1 and Y2 isReferenceAn electronic system has one each of two different types of components in joint operation. Let Y1 and Y2 denote the random lengths of life of the components of type I and type II, respectively. The joint density function is given by(Measurements are in hundreds of hours.) Find P(Y1 > 1, Y2 > 1).
In an electrical system, components of categories I and II have a life expectancy measured in hundreds of hours, respectively. The probability of finding the combined density of Y1 and Y2 is equal to e^(−2).
The components of type I and type II, respectively, have random life spans denoted by the letters Y1 and Y2, respectively. Given by is the joint density function (Measurements are in hundreds of hours.)
Probability P(Y1 > 1, Y2 > 1) = ∫2¹∫1¹ (1/2)e^(−x−y) dx dy = e^(−2).
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Graph:
3/4 times 2^x
Answer:
According to graph calculators online, there is no solution to this equation.
Step-by-step explanation:
May I have Brainliest please? My next rank will be the highest one: A GENIUS! Please help me on this journey to become top of the ranks! I only need 2 more brainliest to become a genius! I would really appreciate it, and it would make my day! Thank you so much, and have a wonderful rest of your day!
Are x=0 and y=3 perpendicular?
Answer:
Yes
Step-by-step explanation:
x = 0 is a vertical line. It's the y-axis.
y = 3 is a horizontal line.
x = 0 and y = 3 are perpendicular lines because they intersect
Answer:
Step-by-step explanation:
Yes, you can figure it out by drawing it out. Unfortunately, you can't compare slopes in this case as vertical lines are undefined.
if a researcher is using a one sample t statistic to test a null hypothesis about a population, what information is needed from the population to calculate the one sample t statistic?
If a researcher is using a one sample t statistic to test a null hypothesis about a population, he needs average, standard deviation and sample size to calculate the one sample t statistics.
What is t- Statistic test ?
Comparing the means of two groups is done statistically using a t test. It is frequently used in hypothesis testing to ascertain whether a method or treatment truly has an impact on the population of interest or whether two groups are distinct from one another.
Since the researcher wants to use one sample t statistic to test a null hypothesis about a population, the formula for t statistic will be followed which can be computed by using some figures which are the average, standard deviation and sample size to calculate the one sample t statistic.
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an architect is making a floor plan for a rectangular gymnasium. if the gymnasium is 80 feet long and 60 feet wide, what will the distance be between opposite corners?
Answer:
the length of the gym will be 80 feet
Step-by-step explanation:
Your college costs $8,792 for the first year but is expected to rise at a rate of 5% per
year. You really work hard to graduate in 4 years, what would the total cost be for all 4
years? Round to 2 decimal places.
Answer:when you're working hard for 4 year graduation and will cost you, 10177.84 for whole 4 year
Number of Text Messages
Amara Sent
0, 2, 5, 6, 9, 10, 15
Number of Text Messages
Marquis Sent
0, 9, 10, 10, 10, 11, 16
1.1 Whose data has a smaller mean? (Circle one.)
Marquis
They're the same
Amara
ale one.)
Answer:
Amara
Step-by-step explanation:
You can find mean by adding the total number of texts sent by each person and dividing it by the number of days.
In this case, the mean of Amara's texts sent is 6.714...
The mean of Marquis' texts sent is 9.428...
Therefore, Amara has the smaller mean.
treatment treatment treatment a b c 32 44 33 30 43 36 30 44 35 26 46 36 32 48 40 sample mean 30 45 36 sample variance 6.00 4.00 6.50 a. at the level of significance, can we reject the null hypothesis that the means of the three treatments are equal? compute the values below (to decimal, if necessary). sum of squares, treatment 570 sum of squares, error 66 mean squares, treatment 285 mean squares, error 5.4 calculate the value of the test statistic (to decimals). 51.81818182 the -value is less than 0.01 what is your conclusion? conclude that not all treatment means are equal b. calculate the value of fisher's lsd (to decimals). 2.17881283 use fisher's lsd procedure to test whether there is a significant difference between the means for treatments a and b, treatments a and c, and treatments b and c. use . difference absolute value conclusion significant difference significant difference no significant difference c. use fisher's lsd procedure to develop a confidence interval estimate of the difference between the means of treatments a and b (to decimals). enter negative values as negative numbers.
The value is less than 0.01
What is Null hypothesis?
The null hypothesis is a common statistical theory that contends that there is no statistical relationship or significance between any two sets of observed data and measured phenomena for any given single observed variable.
Explanation:
[tex]Grand \ mean = \frac{30+45+36}{3} \\\\Grand \ mean = \frac{111}{3} \\\\Grand \ mean = 37[/tex]
TrSS = 5(30-37)²+5(45-37)²+5(36-37)²
TrSS = 570
SSE = (5-1)6²+(5-1)4²+(5-1)(6-5)²
SSE = 66
[tex]HST_{r} = SST_{s}[/tex]
according to given question p value is less than 0.00001 point. Therefore, The value is less than 0.01.
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the distribution of heights of adult american men is approximately normal with mean 69 inches and standard deviation 2.5 inches. what percent of men are between 64 and 66.5 inches tall?
By using normal distribution of probability, it can be calculated that
13.59 %of men are between 64 and 66.5 inches tall
What is normal distribution of probability?
Normal distribution of probability is a continuous type probability distribution whose probability density function is given by
f(x) = [tex]\frac{1}{\sigma \sqrt{2\pi}}e^{-\frac{z^2}{2}}[/tex] where z = [tex]\frac{x - \mu}{\sigma}[/tex]
[tex]\mu[/tex] is the mean and [tex]\sigma[/tex] is the standard deviation.
Here, normal distribution of probability is used
Mean = 69 inches
Standard deviation = 2.5 inches
P(64 < X < 66.5) = P(X <66.5) - P(X < 64)
For X < 64
z = [tex]\frac{64 - 69}{2.5}[/tex] = -2
P(X < 64) = P(z < -2) = 0.0228
For X < 66.5
z = [tex]\frac{66.5 - 69}{2.5}[/tex] = -1
P(X < 66.5) = P(z < -1) = 0.1587
P(64 < X < 66.5) = 0.1587 - 0.0228 = 0.1359
13.59 % men are between 64 and 66.5 inches tall
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Please help me with this
-2 2/3 - (-1 3/5)
Answer:
The answer is -17/15
(Decimal: -4.733333)
x + 4y = 10
2x + 8y = 20
Answer:
x = 2, y = 2
Step-by-step explanation:
Looking at the equations,
x + 4y = 10
2x + 8y = 20
If x = 2, and y = 0 then it would look something like this:
2 + (4×2) = 10
Let's apply that to the next equation:
(2×2) + (8×2) = 20
In conclusion, x = 2, y = 2
the hypotenuse of a right triangle is 6 inches and one of the legs is 6 inches, the exact value of the other leg is
Answer:
h
Step-by-step explanation:
The graph of y=√x is translated 4 units left and 1 unit up to create the function h(x). The graph of h(x) is shown on the coordinate grid.What is the range of h(x)?
{y|y ≥-4}
{y|y ≥ -1}
{y|y ≥ 1}
{y|y ≥ 4}
Answer:
(c) {y|y ≥ 1}
Step-by-step explanation:
You want the range of the square root function after it has been translated left 4 units and up 1 unit.
RangeThe range of the function is the vertical extent of its graph. The original square root function has a range of y ≥ 0. Translating it up 1 unit gives it a range of ...
y ≥ 1
what is the answer to the picture the two answers on there
In the expression given as -5 - (-7) = -5 + x, the value of x is 7.
What is the value of the expression?In Mathematics, expression simply means the mathematical statements which have at least two terms which are then related by an operator. It should be noted that they illustrate the relationship between the data given.
In this situation, it should be noted that the expression is given as:
-5 - (-7) = -5 + x
Collect like terms
-5 + 7 = -5 + x
x = -5 + 5 + 7
x = 7
The value of x is 7.
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the times to complete an obstacle course is normally distributed with mean (μ) 73 seconds and standard deviation (σ) 9 seconds. what is the probability using the empirical rule that a randomly selected finishing time is less than 100 seconds? provide the final answer as a percent rounded to two decimal places.
68.18% is the right answer
a biologist collected 326 fern and moss samples. there were 66 fewer ferns than moss samples. how many fern samples did the biologist collect?
There are 130 fern samples did the biologist collect.
What is fern and moss samples?
In contrast to ferns, which are vascular plants, mosses are nonvascular primitive plants that produce spores. Furthermore, unlike ferns, which have a plant body that is divided into real stems, leaves, and roots, mosses have none of these features. Ferns also have circinate vernation, which is not true of mosses.
Given:
A biologist collected 326 fern and moss samples. there were 66 fewer ferns than moss samples.
Let, f denotes the number of ferns collected and
m denotes the number of mosses collected
From the given information,
m + f = 326 ..(1)
m - 66 = f ..(2)
Plug equation (2) in equation (1),
m + m - 66 = 326
2m = 326 + 66
2m = 392
m = 196
Plug m = 196 in equation (2),
f = 196 - 66
f = 130
Hence, there are 130 fern samples did the biologist collect.
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Wyatt buys eggs and onions at the store. • He pays a total of $20. • He pays $2.52 for the eggs. • He buys 4 bags of onions that each cost the same amount. Wrote an equation that could be used to represent the context of X represents how much each bag of onions costs?
Answer:
X=437 over 100
Step-by-step explanation:
what is the quotient of 7.81\times 10^67.81×10 6 and 7.1 \times 10^37.1×10 3 expressed in scientific notation?
The quotient of 7.81 × 10⁶ and 7.1 × 10³ expressed in scientific notation is approximately 1.10 × 10³.
To find the quotient of 7.81 × 10⁶ and 7.1 × 10³ expressed in scientific notation, we can perform the division first and then convert the result into scientific notation.
Step 1: Perform the division: (7.81 × 10⁶) ÷ (7.1 × 10³)
Step 2: Divide the numerical values: 7.81 ÷ 7.1 = 1.09859155 (approximately)
Step 3: Divide the exponents of the powers of 10: 10⁶ ÷ 10³ = 10³ (since 6 - 3 = 3)
Step 4: 1.09859155 × 10³
Step 5: Adjust the result to be in scientific notation format: 1.09859155 × 10³ ≈ 1.10 × 10³
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The complete question:
What is the quotient of 7.81 × 10⁶ and 7.1 × 10³ expressed in scientific notation?