You are doing a paired-samples t test. What level of measurement is required on the variables you are using?
A) They must be nominal.
B) They must be ordinal.
C) They must be interval/ratio.
D) They can be any level of measurement.

Question

Quizplus · Accepted Answer

A paired-samples t test requires interval/ratio level of measurement on the variables being used. This is because the test relies on calculating the mean difference between paired observations and the standard deviation of these differences, which can only be calculated using interval/ratio data. Nominal and ordinal data do not have a meaningful numerical value that can be used in these calculations.

You Are Doing a Paired-Samples T Test