A Marketing Researcher Was Studying the Effect of a Supermarket

Multiple Choice

A marketing researcher was studying the effect of a supermarket display on sales of a new product. There were two designs for the display: the first had greater visual appeal and the second contained more factual information about the product. Each type of display could be made in three sizes: small, medium, or large. Eighteen supermarkets were available for the study, and three supermarkets were selected at random to display each combination of design and size. The number of units of the product sold over a two-week period was recorded for each supermarket. For the resulting data, a two-way ANOVA was run, with the partial ANOVA table given below. Analysis of variance for sales: In the ANOVA table, the test for the main effect of design has a P-value of 0.613, which indicates that:

A) sales probably vary considerably for the different designs.
B) for about 61.3% of the samples, there was a difference in the effect of design.
C) for about 61.3% of the samples, there was no difference in the effect of design.
D) None of the answer options is correct.