Mathematics, 20.07.2019 09:40 Arealbot

An auto mechanic knows the average time it takes to replace a defective car radiator is 70 minutes with a standard deviation of 12 minutes. this average is based on a random sample of 50. which excel statements will construct a 90% confidence interval for the time needed to replace a defective car radiator? a. =70+1.9612/sqrt(50), and =70-1.9612/sqrt(50) b. =70+1.963.46/sqrt(50), and =70-1.963.46/sqrt(50) c. =70+1.6453.46/sqrt(50), and =70-1.6453.46/sqrt(50) d. =70+1.64512/sqrt(50), and =70-1.64512/sqrt(50) e. none of the above.

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An auto mechanic knows the average time it takes to replace a defective car radiator is 70 minutes w...