The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with mean of 3.2 pounds and standard deviation of 0.8 pound. If a sample of 16 fish is taken, what would the standard error of the mean weight equal?
A) 0.050
B) 0.800
C) 0.003
D) 0.200

Question

Quizplus · Accepted Answer

The formula for standard error of the mean is:
SE = σ/√n
where σ is the standard deviation, n is the sample size. 
Substituting the given values:
SE = 0.8/√16 = 0.8/4 = 0.2 
So, the standard error of the mean weight would equal 0.2 pound. Therefore, the correct choice is D) 0.200.

The Owner of a Fish Market Has an Assistant Who