The sample mean is:
A) the same for all distributions.
B) a random variable specific to each distribution (i.e., it varies from sample to sample).
C) an unknowable quantity.
D) a good indicator of the spread of a data set.

Question

Quizplus · Accepted Answer

The sample mean is calculated using the values in a specific sample, so it will vary from sample to sample. It is not the same for all distributions. It is a measure of central tendency, not a measure of spread, so D is not correct. C is also not correct because the sample mean can be calculated and is not unknowable.

The Sample Mean Is