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smithad1115
20.07.2019 •
Mathematics
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+1.96*12/sqrt(50), and =70-1.96*12/sqrt(50) b. =70+1.96*3.46/sqrt(50), and =70-1.96*3.46/sqrt(50) c. =70+1.645*3.46/sqrt(50), and =70-1.645*3.46/sqrt(50) d. =70+1.645*12/sqrt(50), and =70-1.645*12/sqrt(50) e. none of the above.
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Ответ:
The 90% confidence interval of a random sample of 50 is given by
Ответ:
C. 168
Step-by-step explanation: