The same mean:
A) Is always equal to the population mean.
B) Is always smaller than the population mean.
C) Is found by adding the data values and dividing them by (n-1).
D) Is found by adding all data values and dividing them by n.

Question

Quizplus · Accepted Answer

The same mean (also called sample mean) is found by adding all data values and dividing them by n. This is different from the population mean, but it is still a good estimate of the population mean, especially if the sample is large enough and representative of the population. Option A is incorrect because the same mean is not always equal to the population mean. Option B is incorrect because the same mean can be larger or smaller than the population mean, depending on the sample. Option C is incorrect because dividing by (n-1) is a correction factor used only in certain situations (such as calculating the sample variance or standard deviation), but not for calculating the sample mean.

The Same Mean