A study of 65 bolts of carpet showed that their average length was 72.2 yards. The standard deviation of the population is 4.6 yards. Which of the following is the 90% confidence interval for the mean length per bolt of carpet?
A study of 65 bolts of carpet showed that their average length was 72.2 yards. The standard deviation of the population is 4.6 yards. Which of the following is the 90% confidence interval for the mean length per bolt of carpet?
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