In order to estimate the average daily down time, a manufacturer randomly samples 40 days of production records and found a mean of 55.576 minutes and standard deviation of 77.9 minutes. An 80% confidence interval is:
a. 55.675 ± 1.28(12.32).
b. 55.675 ± 1.304(12.32).
c. 55.675 ± 1.28(77.9).
d. 55.675 ± 1.304(77.9).
B
Business
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