Question: 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

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 15.5.1.
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, , 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.

TABLE 15.5.1 Analysis of Ad Effectiveness Ad 1 Average Standard deviation Sample size (consumers) 01 Ad 2 63.2 68.1 7.9 113 Ad 3 53.5 9.2 97 105

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