Exhibit 8-2 A Random Sample of 121 Automobiles Traveling on an Interstate

Exhibit 8-2
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.
-Refer to Exhibit 8-2. If the sample size was 100 other factors remain unchanged) , the interval for μ would

A) not change
B) become narrower
C) become wider
D) become zero

Correct Answer:

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