# Question

Refer to the data for problem 1.

a. Find the average difference and its standard error for every pair of advertisements (computed as ad 2 minus ad 1, ad 1 minus ad 3, and ad 2 minus ad 3).

b. Test every pair of advertisements at the 1% level and report the results.

a. Find the average difference and its standard error for every pair of advertisements (computed as ad 2 minus ad 1, ad 1 minus ad 3, and ad 2 minus ad 3).

b. Test every pair of advertisements at the 1% level and report the results.

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