Refer to the data for problem 1.
a. Find the average difference between the effectiveness of ad 1 and that of ad 2 (computed as ad 2 minus ad 1).
b.* Find the standard error for this average difference.
c. How many degrees of freedom does this standard error have?
d. Find the 99.9% confidence interval for the population mean difference in effectiveness between ad 1 and ad 2.
e. Are the effectiveness scores of ad 1 and ad 2 very highly significantly different? How do you know?

  • CreatedNovember 11, 2015
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