More time on the Internet: 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 of13.33. Assume these are simple random samples from populations of adults. Can you conclude that the mean number o hours per week spent on the Internet decreased between 2010 and 2012? Let μ1 denote the mean number of hours spent on the Internet in 2010. Use the =α0.10 level and the critical value method with the table. How many degrees of freedom are there, using the simple method? The degrees of freedom using the simple method is
More time on the Internet: 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 of13.33. Assume these are simple random samples from populations of adults. Can you conclude that the mean number o hours per week spent on the Internet decreased between 2010 and 2012?
Let μ1 denote the mean number of hours spent on the Internet in 2010. Use the =α0.10 level and the critical value method with the table.
How many degrees of freedom are there, using the simple method?
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The degrees of freedom using the simple method is
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