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12 December, 14:17

A consumer affairs investigator records the repair cost for 4 randomly selected TVs. A sample mean of $75.89 and standard deviation of $13.53 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.

Step 2 of 2: Construct the 80%80% confidence interval. Round your answer to two decimal places.

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  1. 12 December, 16:36
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    Step-by-step explanation:

    step 2 or 2
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