A Pharmaceutical Company Wanted to Estimate the Population Mean of Monthly

Multiple Choice

A pharmaceutical company wanted to estimate the population mean of monthly sales for their 250 sales people. Forty sales people were randomly selected. Their mean monthly sales were $10,000 with a standard deviation of $1,000. Construct a 95% confidence interval for the population mean.

A) [9,690.1, 10,309.9]
B) [9706.3, 10293.7]
C) [8,040, 11,960]
D) [8,000, 12,000]
E) [9,000, 11,000]