A random sample of 36 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 12 mph. Refer to Exhibit 8-31. The 90% confidence interval for u is 60 to 70 57.735 to 62.265 58.148 to 60.852 56.71 to 63.29
A random sample of 36 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 12 mph. Refer to Exhibit 8-31. The 90% confidence interval for u is 60 to 70 57.735 to 62.265 58.148 to 60.852 56.71 to 63.29
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Transcribed Image Text:Exhibit 8-31
A random sample of 36 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 12
mph.
Refer to Exhibit 8-31. The 90% confidence interval for u is
60 to 70
57.735 to 62.265
58.148 to 60.852
56.71 to 63.29
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