d. Explain what "90% confidence" means. e. Would a 95% confidence interval be wider or narrower? Explain without actually calculating the interval. 3. Aclothing store has randomly selected sales receipts from twenty female and 20 male customers. They wish to test their belief that on average females' purchases are larger than males'. Write the null and alternative hypotheses. 5. A sociologist is comparing the proportion of teenage boys who receive a text message at least once an hour to the percentage of teenage girls who do. She has collected data from 150 men and 150 women. What are the conditions and assumptions that the sociologist should check before creating a confidence interval for the difference in population proportions?
d. Explain what "90% confidence" means. e. Would a 95% confidence interval be wider or narrower? Explain without actually calculating the interval. 3. Aclothing store has randomly selected sales receipts from twenty female and 20 male customers. They wish to test their belief that on average females' purchases are larger than males'. Write the null and alternative hypotheses. 5. A sociologist is comparing the proportion of teenage boys who receive a text message at least once an hour to the percentage of teenage girls who do. She has collected data from 150 men and 150 women. What are the conditions and assumptions that the sociologist should check before creating a confidence interval for the difference in population proportions?
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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Transcribed Image Text:d. Explain what "90% confidence" means.
e. Would a 95% confidence interval be wider or
narrower? Explain without actually
calculating the interval.
3. Aclothing store has randomly selected sales
receipts from twenty female and 20 male
customers. They wish to test their belief that on
average females' purchases are larger than
males'. Write the null and alternative hypotheses.
5. A sociologist is comparing the proportion of
teenage boys who receive a text message at least
once an hour to the percentage of teenage girls
who do. She has collected data from 150 men
and 150 women. What are the conditions and
assumptions that the sociologist should check
before creating a confidence interval for the
difference in population proportions?
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