In an independent groups experiment, if we must estimate the population standard deviation to determine the significance of the sample results, the appropriate inference test is the _________.
A) sign test
B) z test
C) t test
D) none of these

Question

Quizplus · Accepted Answer

When the population standard deviation is not known and must be estimated from the sample data, the appropriate inference test is the t test. Both the z test and sign test assume a known population standard deviation, while the t test takes into account the uncertainty introduced by estimating the standard deviation from the sample.

In an Independent Groups Experiment, If We Must Estimate the Population