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A researcher records the repair cost for 8 randomly selected washers. A sample mean of $60.46...

A researcher records the repair cost for 8 randomly selected washers. A sample mean of $60.46 and standard deviation of $18.36 are subsequently computed. Determine the 90% confidence interval for the mean repair cost for the washers. Assume the population is approximately normal. Step 2 of 2: Construct the 90% confidence interval. Round your answer to two decimal places.

Math   Statistics-And-Probability   
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Answer #1

n = 8

df = n - 1 = 8 - 1 = 7

T score for 90% confidence interval = t7,0.05 = 1.895

Confidence interval

                               

                               

                                = (48.16 , 72.76)

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