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A researcher records the repair cost for 20 randomly selected stereos. A sample mean of $57.17...

A researcher records the repair cost for 20 randomly selected stereos. A sample mean of $57.17 and standard deviation of $19.26 are subsequently computed. Determine the 90% confidence interval for the mean repair cost for the stereos. Assume the population is approximately normal.

Step 2 of 2 :

Construct the 90%90% confidence interval. Round your answer to two decimal places.

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TOPIC:Confidence interval for the population mean.

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