The single-sample t test compares a sample mean to a population mean when:
A) the sample standard deviation is unknown.
B) no comparison can be made based on the variability in either group.
C) the population standard deviation is unknown.
D) a within-groups design is employed.

Question

Quizplus · Accepted Answer

The single-sample t test is used to compare a sample mean to a population mean when the population standard deviation is unknown. The sample standard deviation is used to estimate the population standard deviation, making option A incorrect. Option B is incorrect because there is always a comparison being made between the sample mean and population mean. Option D is incorrect because the single-sample t test is not used in a within-groups design.

The Single-Sample T Test Compares a Sample Mean to a Population