In a random sample of fivefive microwave ovens, the mean repair cost was $75.0075.00 and the standard deviation was $13.0013.00. assume the population is normally distributed and use a t-distribution to construct a 9090% confidence interval for the population mean muμ. what is the margin of error of muμ? interpret the results.

As per given , we have

Sample size : n= 5

Degree pf freedom = : df= 5-1=4

Significance level for 90% confidence =

Using t-value table , t-critical value for 90% confidence:

Margin of error of :

Interpretation : The repair cost will be within $12.39 of the real population mean value 90% of the time.

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step-by-step explanation:

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step-by-step explanation: