Fifteen Stores Were Selected to Test the Effects of Three

Multiple Choice

Fifteen stores were selected to test the effects of three different designs for packaging a tablet on sale. Five stores each were randomly assigned to design 1, 2, or 3. The data below provide the sales over a one-week period. The marketing team decided not to use ANOVA to test whether the three different designs had the same effect on sales or whether sales were increased by some designs over others. The hypotheses to be tested are:

A) H₀: ₁ = ₂ = ₃ vs. H_a: at least two means are different.
B) H₀: median₁ = median₂ = median₃ vs. H_a: at least two medians are different.
C) H₀: sales are not the same for all designs vs. H_a: sales are systematically higher for some designs over others.
D) None of the answer options is correct.