5. The Department of Health and Human Services has been asked to estimate the proportion of "latch-key" children (children who have their own key and come home to an empty house) in New Jersey. This estimate is to be within plus or minus 0.03 of the true population proportion with a 98% level of confidence. The head of the Department's Family Division has no idea of what this proportion might be, so she uses 0.5 as the "estimate" of p. What size sample of New Jersey’s children should be taken?

Answered: Image /qna-images/answer/f8dfa50c-b32b-4245-8240-aaa6c77a17a9.jpg

Answered: The Department of Health and Human…

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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A business magazine article claims that a majority of women age 22 to 35 who work full time would be willing to give up some personal time for a higher salary. You conduct a survey of 1000 women age 22 to 35 who work full time. 540 indicated that they would be willing to give up some personal time in order to make more money. The sample was selected in a way that was designed to be representative of women in the targeted age group. What is the P-Value? Round your answer to 4 decimal places.
A television sports commentator wants to estimate the proportion of citizens who "follow professional football." Complete parts (a) through (c). (a) What sample size should be obtained if he wants to be within 4 percentage points with 95% confidence if he uses an estimate of 52% obtained from a poll? The sample size is (Round up to the nearest integer.)
Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet. How many randomly selected sales transactions must be surveyed to determine the percentage that transpired over the Internet? Assume that we want to be 95% confident that the sample percentage is within five percentage points of the true population percentage for all sales transactions. n= (Round up to the nearest integer.)
A television sports commentator wants to estimate the proportion of Americans who follow professional football (NFL). What sample size should be obtained if he wants to be within 3 percentage points with 95% confidence? Assume he does not use any prior estimates.
In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests." The article says that the overall statewide proportion of school buses that fail safety tests is 9%. However, one bus companyhas a higher rate of over 12%. Assume that we want a new estimate for the statewide proportion of school buses that fail the safety inspection. We take a sample of 200 buses and find that 20 buses fail the safety inspection. What is the sample proportion of buses that fail the test? (Enter your answer as a decimal fraction between 0 and 1, e.g. .27)
A researcher gathered from historical papers that the proportion for the success of an event was between 40% to 60%. When calculating "n" the sample size needed for a given margin of error what should the researcher use for p-hat to arrive at the most conservative (highest) sample size. A. .40 b. .25 C. .60 d. .50
You are a manager for a local convenience store. You want to determine what proportion of your customers would be interested in warm hot dogs for sale in your store. Suppose that you want to have a 99% confidence level in your analysis, and you want your estimate to be within 6.50% of the sample proportion. What is the minimum number of people you need to sample? Round your final answer up to the nearest person, and select the closest value to your answer. Any sample size that is at least 30 will satisfy this requirement. 697 O227 548 393
To determine the proportion of Americans who support affirmative action policies for minorities and women seeking admission to colleges and universities, a sociologist wants to run a poll. What sample size should be collected if she wants the estimate to have a 90% confidence level and be within 4 percentage points?
A television sports commentator wants to estimate the proportion of citizens who "follow professional football." Complete parts (a) through (c). (a) What sample size should be obtained if he wants to be within 22 percentage points with 95% confidence if he uses an estimate of 54% obtained from a poll? The sample size is
a) Find the best point estimate of the population proportion p.
A researcher wants to do a study to see what the proportion of vaccinated people is in a certain area of New Jersey. How many people need to be polled to be with 2% of the actual population proportion with 95% confidence?
Suppose the U.S. president wants to estimate the proportion of the population that supports his current policy toward revisions in the health care system. The president wants the estimate to be within 0.02 of the true proportion. Assume a 90% level of confidence. The president’s political advisors found a similar survey from two years ago that reported that 61% of people supported health care revisions. a. How large of a sample is required? b. How large of a sample would be necessary if no estimate were available for the proportion supporting current policy?

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