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5. A researcher is interested in constructing a confidence interval for the number of hours per week a typical person watches TV. Initial results indicate that the standard deviation is s = 7.5 hours. a) How large a sample is required to obtain a 95% confidence interval with a margin of error of 2 hours? b) How large a sample is required to obtain a 95% confidence interval with a margin of error of 1 hour? c) How large a sample is required to obtain a 99% confidence interval with a margin of error of 1 hour?

5. A researcher is interested in constructing a confidence interval for the number of hours per week a typical person watches TV. Initial results indicate that the standard deviation is s = 7.5 hours. a) How large a sample is required to obtain a 95% confidence interval with a margin of error of 2 hours? b) How large a sample is required to obtain a 95% confidence interval with a margin of error of 1 hour? c) How large a sample is required to obtain a 99% confidence interval with a margin of error of 1 hour?

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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hi can you answer 5 a, b , and c i know you can’t answer d but if you could i would appreciate it thank you
4. The Department of the Treasury is interested in finding out what proportion of people support abolishing the penny. Previous research estimated it to be 15%. How large a sample should be surveyed in order to obtain the result with a 2% margin of error and 95% confidence? 5. A researcher is interested in constructing a confidence interval for the number of hours per week a typical person watches TV. Initial results indicate that the standard deviation is s = 7.5 hours. a) How large a sample is required to obtain a 95% confidence interval with a margin of error of 2 hours? b) How large a sample is required to obtain a 95% confidence interval with a margin of error of 1 hour? c) How large a sample is required to obtain a 99% confidence interval with a margin of error of 1 hour? d) Notice that to get smaller error and/or higher confidence, you need a larger sample. This result is an example of which important Law?
Transcribed Image Text:4. The Department of the Treasury is interested in finding out what proportion of people support abolishing the penny. Previous research estimated it to be 15%. How large a sample should be surveyed in order to obtain the result with a 2% margin of error and 95% confidence? 5. A researcher is interested in constructing a confidence interval for the number of hours per week a typical person watches TV. Initial results indicate that the standard deviation is s = 7.5 hours. a) How large a sample is required to obtain a 95% confidence interval with a margin of error of 2 hours? b) How large a sample is required to obtain a 95% confidence interval with a margin of error of 1 hour? c) How large a sample is required to obtain a 99% confidence interval with a margin of error of 1 hour? d) Notice that to get smaller error and/or higher confidence, you need a larger sample. This result is an example of which important Law?
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