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A supervisor records the repair cost for 17 randomly selected TVs A sample mean of...

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A supervisor records the repair cost for 17 randomly selected TVs A sample mean of 94 57 and standard deviation of 20 65 are subsequently computed Determine the 80 confidence interval for the mean repair cost for the TVs Assume the population is approximately normal Step 1 of 2 Find the critical value that should be used in constructing the confidence interval Round your answer to three decimal places

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To find the critical value for an 80 confidence interval when the sample size is 17 we use the tdistribution because the population    See Answer
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