During a Test Period, an Experimental Group of 10 Vehicles

question 14

Multiple Choice

During a test period, an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixture showed mean CO₂ emissions of 240 pounds per 100 miles, with a standard deviation of 20 pounds. A control group of 14 vehicles using regular gasoline showed mean CO₂ emissions of 252 pounds per 100 miles with a standard deviation of 15 pounds. A quick comparison of the sample variances suggests that the population variances are:

• A)probably equal.
• B)probably unequal.
• C)incomparable.

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Definitions:

Integrity

The quality of being honest and having strong moral principles; moral uprightness.

Unimpaired

In a state of being undamaged, unaffected, or able to function at full capacity without any reduction in value or quality.

Optimization

The process of making something as fully perfect, effective, or functional as possible, often by using mathematical models or algorithms.