#28). A campaign staffer would like to estimate the proportion of likely voters who will vote for a particularcandidate in the upcoming election. To help with this estimate, the staffer surveyed a small group of likelyvoters and found that 80% of the sample supported the candidate.How large a sample should be selected such that the margin of error of the estimate for a 90% confidenceinterval is at most 5.6%. Round the solution up to the nearest whole number.n =Question Help: Video

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Answered: A campaign staffer would like to…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential shortage of vaccines for the area. She will need to provide a recommendation for how to allocate the vaccines appropriately across the city. She takes a simple random sample of 332 people living in East Vancouver and finds that 31 have recently had the flu. Suppose that the epidemiologist wants to re-estimate the population proportion and wishes for her 95% confidence interval to have a margin of error no larger than 0.03. How large a sample should she take to achieve this? Please carry answers to at least six decimal places in intermediate steps.
An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential shortage of vaccines for the area. She will need to provide a recommendation for how to allocate the vaccines appropriately across the city. She takes a simple random sample of 332 people living in East Vancouver and finds that 36 have recently had the flu. Suppose that the epidemiologist wants to re-estimate the population proportion and wishes for her 95% confidence interval to have a margin of error no larger than 0.04. How large a sample should she take to achieve this? Please carry answers to at least six decimal places in intermediate steps, and use at least 3 decimal places in your critical value. Sample size =
A researcher wishes to estimate, with 95% confidence, the population proportion of families who eat fast food at least once per week. Her estimate must be accurate within 3% of the population proportion.Find the minimum sample size needed, using a prior study that found that 16% of the respondents said they eat fast food four to six times per week
In describing the findings of a 2010 Public ReligionResearch Institute poll, the researchers reported a 3%margin of error at a 95% confidence level. If instead theyhad used a 99% confidence level, their margin of errorwould have been:A) still 3%, because the same sample is used.B) more than 3%, because they reported greaterconfidence.C) less than 3%, because they reported greaterconfidence.D) more than 3%, because this sample is too small.E) less than 3%, because this sample is too small.
An economist needs to estimate the proportion of residents of Jensen Beach that have earned a college degree. Determine the most conservative estimate of the sample size required to limit the margin of error to within 0.031 of the population proportion for a 98% confidence interval Round the solution up to the nearest whole number .
A television sports commentator wants to estimate the proportion of citizens who follow professional football. What sample size should be obtained if he wants to be within 4 percentage points with 96% confidence, if he uses an estimate of 54% obtained from a poll? What sample size should be obtained if he wants to be within 4 percentage points with 96% confidence if he does not use any prior estimates? Why are the results so close?
In exploring possible sites for a convenience store in a large neighbourhood, the retail chain wants to know the proportion of ratepayers in favour of the proposal. If the estimate is required to be within 0.1 of the true proportion, would a random sample of size n = 100 from the council records be sufficient for a 95% confidence interval of this precision?
A marketing researcher for a phone company conducteda survey of 500 people and then constructed a confidenceinterval for the proportion of customers who are likelyto switch providers when their contract expires. Afterseeing this interval, the company CEO insisted that theresearcher repeat the survey and provide an interval witha margin of error half as large. What sample size shouldthe researcher use for the new survey?A) 250 B) 354 C) 708D) 1000 E) 2000
The Nielson television ratings used a sample of 2,000 homes to estimate the proportion of all homes that watch Monday Night football. A previous survey showed the proportion to be 45% (.45 ) of homes watched Monday Night Football. If a 99% confidence is required, what would the margin of error be with a new survey and making use of the old proportion. Round answer to the nearest percent.
Kim wants to determine a 99 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must she have to get a margin of error less than 0.03? [Round to the smallest integer that works.] n =
A Gallup poll asked a random sample of U.S. adults, “Would you like to lose weight?” Based on this poll, the 95% confidence interval for the population proportion who want to lose weight is (0.56, 0.62). How would the width of a 95% confidence interval based on a sample size four times as large compare to the original 95% interval, assuming the sample proportion remained the same? The length of the interval would be half as wide. The length of the interval would increase. The length of the interval would be one-fourth as wide. The length of the interval would stay the same. The length of the interval would double.
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