THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A supermarket chain has 25 stores in the North,30 in the South,50 in the Midwest,and 35 in the West.Using a proportional allocation of a random sample of 30% of the outlets,the manager records the following means and standard deviations.

-Estimate the population mean.
A)134.38
B)158.31
C)142.69
D)165.44

Question

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A supermarket chain has 25 stores in the North,30 in the South,50 in the Midwest,and 35 in the West.Using a proportional allocation of a random sample of 30% of the outlets,the manager records the following means and standard deviations.
 
-Estimate the population mean.
A)134.38 
B)158.31 
C)142.69 
D)165.44

Quizplus · Accepted Answer

To estimate the population mean, we can use the formula:

population mean = (sample mean) * (total number of outlets) / (sample size)

Plugging in the given values:

population mean = 140.23 * (25+30+50+35) / (0.3*140) = 142.69

Therefore, the best choice is C) 142.69.