The sample mean of a variable is 137.6, and is reported with an associated p value of 0.001. How could this p value be interpreted as?
A) Probability of .999 that true mean is null, when sample mean is 137.6.
B) The chance of the population or true mean being 137.6 is 0.001.
C) Probability of .001 that population mean is 0, when sample mean is 137.6.
D) 99.9% chance that the true mean is greater than 137.6.

Question

Quizplus · Accepted Answer

The p-value of 0.001 indicates the probability of observing a sample mean as extreme as 137.6 or more extreme, assuming the null hypothesis (often that the population mean is 0 or some other specified value) is true. It does not directly tell us the probability that the population mean is a specific value or that the true mean is greater than a specific value.

The Sample Mean of a Variable Is 137