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    Confidence Interval for Population Mean: Weight of Trucks

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    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. The population standard deviation is known to be 3.85 tons. What is the 90 percent confidence interval for the population mean?

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    Solution Summary

    The solution provides step-by-step method for the calculation of confidence interval for mean. Formula for the calculation and Interpretations of the results are also included. The user can edit the inputs and obtain the complete results for a new set of data.