7 16 Using an app or the Web on a smartphone The Nielsen Company reports that U S residents aged 18 to 34 years spend an average of 2 83 hours per day using an app or the Web on a smartphone You wonder if this it true for students at your large university because you rarely see students not using their smartphones You collect an SRS of n 75 students and obtain x 3 17 hours with s 1 36 hours 15 a Report the 95 confidence interval for , the average number of hours per month that students at your university use the Internet on a computer b Use this interval to test whether the average time for students at your university is different from the average reported by Nielsen Use the 5 significance level Summarize your results

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Question: 7.16 Using an app or the Web on a smartphone. The Nielsen Company reports that U.S. residents aged 18 to 34 years spend an average

7.16 Using an app or the Web on a smartphone. The Nielsen Company reports that U.S. residents aged 18 to 34 years spend an average of 2.83 hours per day using an app or the Web on a smartphone.

You wonder if this it true for students at your large university because you rarely see students not using their smartphones. You collect an SRS of n=75 students and obtain x¯=3.17 hours with s=1.36 hours.

a. Report the 95% confidence interval for

μ , the average number of hours per month that students at your university use the Internet on a computer.

b. Use this interval to test whether the average time for students at your university is different from the average reported by Nielsen. Use the 5% significance level. Summarize your results.

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