A Local Consumer Reporter Wants to Compare the Average Costs

question 62

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.

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Definitions:

Reticular Fibers

Fine, branching fibers forming networks in various tissues and supporting cells in organs like the spleen and lymph nodes.

Medulla

The innermost part of an organ or structure, often referring to the medulla oblongata in the brain, which controls vital functions such as breathing and heart rate.

Lymphocytes

White blood cells that play a crucial role in the immune system, responsible for producing antibodies and other substances to fight infections.

Adaptive Immunity

A component of the immune system that involves the creation of antibodies and memory cells to provide long-term immunity against pathogens.