For an independent-samples t test, the test variable (the variable whose values will be averaged for each group) can be what level of measurement?
A) only interval/ratio
B) either interval/ratio or ordinal
C) interval/ratio, ordinal, or nominal

Question

Quizplus · Accepted Answer

An independent-samples t test is used to compare the means of two independent groups, so the test variable (the variable whose values will be averaged for each group) should be measured at the interval/ratio level to allow for meaningful averaging and statistical comparison. If the variable is measured at the nominal or ordinal level, the values cannot be averaged in a meaningful way and the test would not be appropriate.

For an Independent-Samples T Test, the Test Variable (The Variable