A Local Consumer Reporter Wants to Compare the Average Costs

question 50

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. $$\begin{array} { l l c c c } \hline & { \text { Item } } & \mathrm { A } & \mathrm { B } & \mathrm { C } \\\hline \text { 1) } & \text { paper towels } & 1.22 & 1.42 & 1.37 \\\text { 2) } & \text { cereal } & 2.70 & 3.15 & 2.90 \\\text { 3) } & \text { floor cleaner } & 5.91 & 5.79 & 6.80 \\\text { ? } &\text { ? } &\text { ? } &\text { ? }&\text { ? } \\\text { 59) } & \text { shaving cream } & 1.00 & 0.90 & 0.96 \\\text { 60) } & \text { canned green beans } & 0.54 & 0.69 & 0.46 \\\hline\end{array}$$ Identify the dependent (response) variable for this experiment.

• A) the prices of the grocery items
• B) the grocery items
• C) the supermarkets
• D) the mean prices of the grocery items at each supermarket

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Definitions:

Nervous system

The complex network of nerve cells and fibers that transmits nerve impulses between parts of the body, central to controlling and coordinating body activities.

Neurons

Specialized cells within the nervous system that transmit information to other nerve cells, muscle, or gland cells, often referred to as the basic working units of the brain.

Lymphocytes

A type of white blood cell that is part of the immune system, helping the body to fight infections and diseases by recognizing antigens and producing antibodies.

Neutrophils

A type of white blood cell that helps the body fight infection by ingesting bacteria and debris.