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A survey of 39 adults found that the mean age of a person's primary vehicle is 5.6 years. Assume that the standard deviation of the population is 0.8 year.

a. Estimate the population mean age of all persons' primary vehicles with 90% confidence. Please show the formula that you used as well as your calculations for full credit.

b. Interpret your confidence interval in the context of the problem (no symbols).

 

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