The Bata Shoe Museum states that 16% of women wear shoes that are too small for their feet. A researcher wants to be 98% confident that this proportion is within 0.015 of the true proportion. How large a sample is necessary?

Q: The use of the Internet is constantly growing. How many randomly selected adults must be surveyed to…

A: Solution

Q: Suppose 4 percent of the children in the US are thought to be near the juvenile diabetes threshold.…

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Q: A sample of size 80 which found to contain 21 smokers. What is the sample proportion of non-smokers…

A: A population is the complete set of elements for which the study or experiment is conducted. A…

Q: Suppose that you conduct a hypothesis test for a proportion using a sample size of n=50 and you…

A: Answer: As sample increases  the p-value decreases.

Q: The executives at Sandbachian, inc., having recently solved their widget crisis, have another…

A: Let ‘x’ be the no of defective manhole covers i.e x=40 and n=800 sample propotion (P)=x/n p=40/800…

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: From the provided information, the hypothesis, that if two proportions, i.e., the proportion of…

Q: You are running a political campaign and wish to estimate, with 95% confidence, the proportion of…

A: Formula for the sample size needed to estimate a population proportion is

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A:

Q: Suppose you select a simple random sample of 75 Douglas College students, and you find that 8 are…

A: The point estimate of the population proportion is the sample proportion. Given that, 8 out of the…

Q: Can you think of an area where it might not be practical, for a variety of reasons, to sample 100%…

A: Given:- We can think of an area where it might be practical, for a variety of reasons ,to sample…

Q: A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a…

A: Given,          Sample proportion  P∧=0.09          Margin of Error∈=0.04          and…

Q: What is the formula to be used to determine the total possible random samples?

A: Let the population size be N Sample size be n

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: When we don't have any prior information about population proportion, we generally take it as 0.50.…

Q: illustrates the effect of sample size on the power of a two-sample t test?

A: A test of hypothesis consists of 2 hypotheses: the null, H0, and the alternative, H1.   For a sample…

Q: A poll in Canada states that 67% of all respondents favor imposing the death penalty. The poll was…

A: Given that - A poll in Canada states that 67% of all respondents favor imposing the death penalty.…

Q: When you are conducting the t test, the sample size must be greater than .30

A: We have to find the statement is true or false....

Q: The owner of a local bar specializing in alternative music wanted to determine the average age of…

A: t 95% confidence level, the z value is 1.96 which can be obtained by using the standard normal…

Q: A researcher wishes to estimate the number of households with two cars. How large a sample is needed…

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Q: Find the probability that mean of sample size 36 will be negative.

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Q: If σ = 35, what sample size would you need to get the standard error to be at most 2.5? If the…

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Q: A researcher wishes to estimate the number of households with two computers. How large a sample is…

A: given data   CI = 0.90, P ( - Z< P < Z ) = 0.90 therefore z = 1.645 ( =z table ) E = 6% =…

Q: Suppose that you are attempting to estimate the weight of 600 parts. In order to use the infinite…

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Q: Twenty years ago, 46% of parents of children in high school felt it was a serious problem that high…

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Q: A Plitical pollster wants to know what proportion of voters think james burger should go away and…

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Q: Male penguins that weigh more than 4710 grams are considered "desirable" because the extra fat means…

A: We need to find expected value of desirable penguins Let us find out probability of a desirable…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: If you draw a random sample of 100 scores from a large population of test scores and compute the…

A: As we increase z value, corresponding probability of occurence decreases. hence, The event among…

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: From the provided information, Margin of error (E) = 6% that is 0.06 Confidence level = 95% The…

Q: a pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: Given P=0.09 E=0.06 Z(0.01)=2.33

Q: should their sample size be?

A: here use solvin's formula

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: The formula for margin of error is given as follows: E=zα/2p11-p1n+p21-p2n

Q: A company claims that 90% of its deliveries arrive on time. You take a sample of 74 deliveries, of…

A: Given,   The sample proportion is,

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: question: If a manufacturer conducted a survey among randomly selected target market households and…

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: From the provided information, Sample size (n) =750 and p0 = 0.54

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A:

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Given Data: Margin of Error=0.22 p=0.54   z-value=1.96

Q: The executives at Sandbachian, Inc., has recently solved their widget crisis, have another problem…

A:

Q: 1. How many samples must be considered from a population of 28,000 students, if 5% margin of error…

A:

Q: A school board would like to determine whether there is a difference in average SAT scores for…

A: Paired data is used when experimental Unit is same on which two different treatment are apllied

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The value of p0 is 0.52 and the sample size n is 800.

Q: A university dean is interested in determining the proportion of students who receive some sort of…

A:

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A:

Q: A poll found that 83% of people out of a survey of size 127 watch at least three hours of TV per…

A: Given: A poll found that 83% of people out of a survey of size 127 watch at least three hours of TV…

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: From the provided information, Study indicates that proportion of left-handed scientists is 9% that…

Q: The manager of a small supermarket chain wants to estimate the proportion of time stockclerks spend…

A: Assume that the population proportion is 0.5. It is known that the critical value for 98% confidence…

Q: Because of the increased cost of housing, a national real estate board wants to compare the…

A: (a): Null hypothesis H0: proportion of rural areas = proportion of metropolitan areas H1: proportion…

Q: A poll found that 71% of people out of a survey of size 130 watch at least three hours of TV per…

A: From the given information,   A poll found that 71% of people out of a survey of size 130 watch at…

Q: A university dean is interested in determining the proportion of students who receive some sort of…

A: Given: Confidence level=95%Margin of error E=2% From the Standard Normal Table, the value of z* for…

Q: A pollster wishes to estimate the proportion of United States voters who favor capital punishment.…

A: Given that, Critical value: Using the z-table, the critical value at 90% confidence level is