Multiple Choice
The dollar value of orders placed through a particular store catalog is found to be normally distributed with a standard deviation of $21.58.A sample of 30 orders averaged $81.25.What is the 90% confidence interval around this sample mean?
A) $81.25 ± $21.58
B) $81.25 ± $10.79
C) $81.25 ± $12.15
D) $81.25 ± $6.48
Correct Answer:
Verified
Correct Answer:
Verified
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