A Local Consumer Reporter Wants to Compare the Average Costs

Multiple Choice

A local consumer reporter wants to compare the average costs of grocery items purchased at three different supermarkets, A, B, and C. Prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket. The results of a Bonferroni analysis are summarized below. ___________ $\begin{array}{lccc}\text { Supermarket } & \text { A } &\overline{ \text { B} \quad \text { C }} \\\text { Mean Price } & 1.665 & 1.919 \quad 1.925 \end{array}$
Interpret the Bonferroni analysis results.

A) A has a significantly smaller mean price than either of the other two supermarkets.
B) A has a significantly larger mean price than either of the other two supermarkets.
C) C has a significantly larger mean price than either of the other two supermarkets.
D) B and C have significantly different mean prices.