Exhibit 8-3
a Random Sample of 81 Automobiles Traveling on a Section

question 69

Multiple Choice

Exhibit 8-3
A random sample of 81 automobiles traveling on a section of an interstate showed an average speed of 60 mph. The distribution of speeds of all cars on this section of highway is normally distributed, with a standard deviation of 13.5 mph.
-Refer to Exhibit 8-3. If we are interested in determining an interval estimate for $\mu$ at 86.9% confidence, the z value to use is

• A)1.96
• B)1.31
• C)1.51
• D)2.00

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Definitions:

Capitation

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