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The mean weight of trucks traveling on a particular section of I-475 is not known. A...

The mean weight of trucks traveling on a particular section of I-475 is not known. A state highway inspector needs an estimate of the mean. He selects and weighs a random sample of 46trucks and finds the mean weight is 17.9 tons. The population standard deviation is 3.9 tons. What is the 95% confidence interval for the population mean?
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Answer #1

Given that, sample size ( n ) = 46

sample mean = 17.9

population standard deviation = 3.9

A 95% confidence level has significance level of 0.05 and critical value is,

The 95% confidence interval for population mean is,

Therefore, the 95% confidence interval for population mean is, ( 16.773, 19.027 )

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