A Random Sample of 121 Automobiles Traveling on an Interstate

question 125

Multiple Choice

A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph. The 95 percent confidence interval for μ is determined as (61.08, 68.92) . If we are to reduce the sample size to 100 (other factors remain unchanged) , the 95 percent confidence interval for μ would:

• A) become wider.
• B) become narrower.
• C) be the same.
• D) be impossible to determine.

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Definitions:

Normal-Weight People

Individuals whose body weight falls within a range considered healthy, according to measurements such as body mass index (BMI).

Energy Output

The amount of energy produced or expended in a process, such as during physical activity or by a mechanical or electrical device.

Breast-Fed

The act of feeding a baby with milk directly from the mother's breast, which is believed to provide ideal nutrition and immune system benefits.

Anxiety Level

A measure of the intensity of anxiety symptoms experienced by an individual, ranging from mild to severe, which can impact daily functioning and well-being.