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How hard is it to reach a person by phone when doing a survey? Let p be the proportion of calls for which a polling agency reaches a person being called on the first try. The polling agency Gallup did a previous study and found that approximately 7% of people can be reached by a single phone call. How many calls should you include in a random sample to be 80% sure the point estimate will be a distance of E = 0.03 from p? In other words, determine the sample size needed if you want to be 80% confident that your sample proportion will be no more than E = 0.03 from p. (Remember to round up) In your answer make sure to do the following: 1. Write down the formula you used. 2. Write down the numbers you plugged into the formula 3. Write down your final answer Answers that do not show these steps will not receive credit. Upload Choose a File « Previous Next

How hard is it to reach a person by phone when doing a survey? Let p be the proportion of calls for which a polling agency reaches a person being called on the first try. The polling agency Gallup did a previous study and found that approximately 7% of people can be reached by a single phone call. How many calls should you include in a random sample to be 80% sure the point estimate will be a distance of E = 0.03 from p? In other words, determine the sample size needed if you want to be 80% confident that your sample proportion will be no more than E = 0.03 from p. (Remember to round up) In your answer make sure to do the following: 1. Write down the formula you used. 2. Write down the numbers you plugged into the formula 3. Write down your final answer Answers that do not show these steps will not receive credit. Upload Choose a File « Previous Next

MATLAB: An Introduction with Applications
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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How hard is it to reach a person by phone when doing a survey? Let p be the proportion of calls for which a polling agency reaches a person being called on the first try. The polling agency Gallup did a previous study and found that approximately 7% of people can be reached by a single phone call. How many calls should you include in a random sample to be 80% sure the point estimate will be a distance of E = 0.03 from p? In other words, determine the sample size needed if you want to be 80% confident that your sample proportion will be no more than E = 0.03 from p. (Remember to round up) In your answer make sure to do the following: 1. Write down the formula you used. 2. Write down the numbers you plugged into the formula 3. Write down your final answer Answers that do not show these steps will not receive credit. Upload Choose a File « Previous Next
Transcribed Image Text:How hard is it to reach a person by phone when doing a survey? Let p be the proportion of calls for which a polling agency reaches a person being called on the first try. The polling agency Gallup did a previous study and found that approximately 7% of people can be reached by a single phone call. How many calls should you include in a random sample to be 80% sure the point estimate will be a distance of E = 0.03 from p? In other words, determine the sample size needed if you want to be 80% confident that your sample proportion will be no more than E = 0.03 from p. (Remember to round up) In your answer make sure to do the following: 1. Write down the formula you used. 2. Write down the numbers you plugged into the formula 3. Write down your final answer Answers that do not show these steps will not receive credit. Upload Choose a File « Previous Next
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