A Highway Inspector Needs an Estimate of the Mean Weight

question 31

Multiple Choice

A highway inspector needs an estimate of the mean weight of trucks crossing a bridge on the interstate highway system. She selects a random sample of 49 trucks and finds a mean of 15.8 tons with a sample standard deviation of 3.85 tons. The 90 percent confidence interval for the population mean is:

• A)14.72 to 16.88 tons.
• B)14.90 to 16.70 tons.
• C)14.69 to 16.91 tons.
• D)14.88 to 16.72 tons.

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