Aconsumer 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.