Asked by Cheryl

A group of 49 randomly selected construction workers has a mean age of 22.4 years with a standard deviation of 3.8. According to a recent survey, the mean age should be mu=21.9. Test this hypothesis by constructing a 98% confidence interval for the population mean.

Answers

Answered by Kuai

21. 9 -2.33* 3.8 /sqrt((49)), 21. 9 + 2.33* 3.8 /sqrt((49))
(20.64, 23.16)

98% confidence interval contain
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