# Question

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?

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?

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