Is there a difference in the mean price for vitamins at the retail outlets provided in the “Vitamins” tab? Use alpha = .05.
a. Yes, the average ranges from $4.92 to $5.93 — the range of means is very spread out.
b. Yes, the sum of squared errors between stores is two times that within group – enough to reject the claim the means are equal.
c. No, the F value is far less than F critical, thus we cannot reject the claim that the means are equal.
d. No, the t-value comparing the difference of means is insufficiently different to reject the claim of equal means.