Multiple Choice
An advertising company wishes to estimate the mean household income for all single working professionals who own a foreign automobile. If the advertising company wants a 90% confidence interval estimate with a margin of error of ±$2,500, what sample size is needed if the population standard deviation is known to be $27,500?
A) 156
B) 328
C) 251
D) 415
Correct Answer:
Verified
Correct Answer:
Verified
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