A random sample of 144 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.3 ounces. The standard error of the mean equals
A) 0.3333.
B) 0.15.
C) 0.025.
D) 4.000.

Question

Quizplus · Accepted Answer

The standard error of the mean is calculated as the population standard deviation divided by the square root of the sample size: 0.3 / √144 = 0.025.

A Random Sample of 144 Bottles of Cologne Showed an Average