A Local Consumer Reporter Wants to Compare the Average Costs

Essay

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 the Bonferroni analysis are summarized below. ___________________ $\begin{array}{llll}\text { Supermarket } & \overline{\text { A } \quad \text { B } }& \text { C } \\\text { Mean Price } & 1.66 \quad1.80 & 1.94\end{array}$ Fully interpret the Bonferroni analysis.