The Principal of a Middle School Claims That Test Scores $\sigma = 14.7$

question 31

Multiple Choice

The principal of a middle school claims that test scores of the seventh-graders at her school vary less than the test scores of seventh-graders at a neighboring school, which have variation described by $\sigma = 14.7$ .

• A)
• \(\begin{array}{l}
• H_{0}: \sigma=14.7 \\
• H_{1}: \sigma<14.7
• \end{array}\)
• B)
• \(\begin{array}{l}
• \mathrm{H}_{0}: \sigma=14.7 \\
• \mathrm{H}_{1}: \sigma>14.7
• \end{array}\)
• C) \(\begin{array}{l}
• \mathrm{H}_{0}: \sigma<14.7 \\
• \mathrm{H}_{1}: \sigma>14.7
• \end{array}\)
• D)
• \(\begin{array}{l}
• \mathrm{H}_{0}: \sigma>14.7 \\
• \mathrm{H}_{1}: \sigma \leq 14.7
• \end{array}\)

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Definitions:

Demand Curve

A graph showing the relationship between the price of a good and the quantity demanded by consumers at various price levels.

Percentage Change

A mathematical calculation that indicates the degree of change over time, expressed as a proportion of the starting value.

Total Revenue

The complete amount of income generated by the sale of goods or services before any expenses are subtracted.

Price Elasticity

A measure of how much the quantity demanded of a good responds to a change in the price of that good, indicative of the sensitivity of consumers to price changes.