Question

A researcher polled a sample of 1020 adults in the year 2010, asking them how many hours per week they spent on the Internet. The sample mean was 10.52 with a standard deviation of 14.76 . A second sample of 1071 adults was taken in the year 2012. For this sample, the mean was 9.58 with a standard deviation of 13.33. Assume these are simple random samples from populations of adults. Can you conclude that the mean number of hours per week spent on the Internet decreased between 2010 and 2012? Use the level and the -value method with the TI-84 calculator.

Name: a researcher polled a sample of 1020 adults in the year 2010 asking them how many hours per week they spent on the internet the sample mean was 1052 with a standard deviation of 1476 a secon 73961
Uploaded: 2023-05-21T15:27:59-08:00
Duration: 3 min 58 s
Channel: Prabhakar Kumar
Description: a researcher polled a sample of 1020 adults in the year 2010 asking them how many hours per week they spent on the internet the sample mean was 1052 with a standard deviation of 1476 a secon 73961

          A researcher polled a sample of 1020 adults in the year 2010, asking them how many hours per week they spent on the Internet. The sample mean was 10.52 with a standard deviation of 14.76 . A second sample of 1071 adults was taken in the year 2012. For this sample, the mean was 9.58 with a standard deviation of 13.33. Assume these are simple random samples from populations of adults. Can you conclude that the mean number of hours per week spent on the Internet decreased between 2010 and 2012?  Use the level and the -value method with the TI-84 calculator.

Added by Tonya F.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Prabhakar Kumar

05/21/2023

Step 1

- H0: μ1 = μ2 (no change) - Ha: μ1 > μ2 (mean in 2010 is greater than mean in 2012; i.e., a decrease is indicated) Show more…

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A researcher polled a sample of 1020 adults in the year 2010, asking them how many hours per week they spent on the Internet. The sample mean was 10.52 with a standard deviation of 14.76 . A second sample of 1071 adults was taken in the year 2012. For this sample, the mean was 9.58 with a standard deviation of 13.33. Assume these are simple random samples from populations of adults. Can you conclude that the mean number of hours per week spent on the Internet decreased between 2010 and 2012? Use the level and the -value method with the TI-84 calculator.