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Question
Exhibit 8-3A 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 ïat 86.9% confidence, the zvalue to use is
a. 1.96
b. 1.31
c. 1.51
d. 2.00
Answer
This answer is hidden. It contains 1 characters.
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