1. Over the last several years, the use of cellphones has increased dramatically. An article in USA Today reported that according to a poll, the mean talking time per month for cellphones was 372 minutes for men and 275 for women, while the mean talking time per month for traditional home phones was 334 minutes for men and 510 minutes for women. Suppose that the poll was based on a sample of 100 men and 100 women, and that the standard deviation of the talking time per month for cellphones was 120 minutes for men and 100 minutes for women, while the standard deviation of the talking time per month for traditional home phone was 100 minutes for men and 150 minutes for women. (critical value = +1.96) a. Is there evidence of a difference in the mean monthly talking time on cellphones for men and women? b. Is there evidence of a difference in the mean talking time on traditional home phone for men and women?
1. Over the last several years, the use of cellphones has increased dramatically. An article in USA Today reported that according to a poll, the mean talking time per month for cellphones was 372 minutes for men and 275 for women, while the mean talking time per month for traditional home phones was 334 minutes for men and 510 minutes for women. Suppose that the poll was based on a sample of 100 men and 100 women, and that the standard deviation of the talking time per month for cellphones was 120 minutes for men and 100 minutes for women, while the standard deviation of the talking time per month for traditional home phone was 100 minutes for men and 150 minutes for women. (critical value = +1.96) a. Is there evidence of a difference in the mean monthly talking time on cellphones for men and women? b. Is there evidence of a difference in the mean talking time on traditional home phone for men and women?
Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 31EQ
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1. Over the last several years, the use of cellphones has increased dramatically. An article in USA
Today reported that according to a poll, the mean talking time per month for cellphones was
372 minutes for men and 275 for women, while the mean talking time per month for traditional
home phones was 334 minutes for men and 510 minutes for women. Suppose that the poll was
based on a sample of 100 men and 100 women, and that the standard deviation of the talking
time per month for cellphones was 120 minutes for men and 100 minutes for women, while the
standard deviation of the talking time per month for traditional home phone was 100 minutes
for men and 150 minutes for women. (critical value = +1.96)
a. Is there evidence of a difference in the mean monthly talking time on cellphones for
men and women?
b. Is there evidence of a difference in the mean talking time on traditional home
phone for men and women?
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