Question: Refer to the data for problem.
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.
Problem: Three advertisements have been tested, each one using a different random sample of consumers from the same city. Scores indicating the effectiveness of the advertisement were analyzed; the results are shown in Table.
a. Which advertisement appears to have the highest effectiveness? Which appears to have the lowest? b. Find the total sample size, n, the grand average, X, and the number of samples, k.
c. Find the between-sample variability and its degrees of freedom.
d. Find the within-sample variability and its degrees of freedom.
