In a pilot study examining the effectiveness of three commercials (A. B. and C), 10 consumers were assigned to view each commercial and rate it on a 9-point Likert scale, flic data obtained from the 30 respondents are shown in the table.

a. Calculate the category means and the grand mean.
b. Calculate SSy, SSx, and SSerror
c. Calculate Æž2.
d. Calculate the value of F.
e. Are the three commercials equally effective?

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Commercial A B C 4 Commercial A B C 4 5 6 4 4