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Chief Grady wants to know whether the mean speed of vehicles on a particular stretch of...

Chief Grady wants to know whether the mean speed of vehicles on a particular stretch of Pat Bay Highway exceeds the posted speed limit of 90 km per hour. He has a sample of 35 car speeds with a mean speed of 93 km per hour and a sample standard deviation of 4 km per hour. Chief Grady wishes to estimate the true mean speed of all vehicles passing this stretch of Pat Bay Highway using a 95% confidence interval. Find the upper limit of 95% confidence interval.

93.4

91.4

92.4

94.4

95.4
Math   Statistics-And-Probability   
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