A Local Consumer Reporter Wants to Compare the Average Costs

question 30

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.
$\begin{array} { c l r c c } \hline & { \text { Item } } & \text { A } & \text { B } & \text { C } \\\hline \text { 1) } & \text { paper towels } & 1.23 & 1.43 & 1.38 \\\text { 2) } & \text { cereal } & 2.70 & 3.15 & 2.90 \\\text { 3) } & \text { floor cleaner } & 6.09 & 5.97 & 6.98 \\\vert &\vert&\vert&\vert& \vert \\59 ) & \text { shaving cream } & 1.09 & 0.99 & 1.05 \\60 ) & \text { canned green beans } & 0.55 & 0.70 & 0.47 \\\hline\end{array}$


Identify the blocks for this experiment.

• A) the 60 grocery items
• B) the \(60 \times 3 = 180\) prices
• C) the three supermarkets
• D) the day on which the data were collected

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Definitions:

Axon

An extended, narrow part of a nerve cell, known as a neuron, that generally carries electrical impulses from the neuron's main body.

Electrical Impulses

The signals that neurons use to communicate with each other, consisting of changes in electric potential across neuronal membranes.

Reticular Formation

A network of neurons located in the brainstem, involved in controlling arousal and attention.

Stimuli

Physical or chemical changes in the internal or external environment that influence or trigger responses in organisms.