For testing the difference between two sample means, the level of measurement is assumed to be________.
A) nominal.
B) ordinal.
C) interval-ratio.
D) Any of the answer choices

Question

Quizplus · Accepted Answer

Interval-ratio level of measurement is assumed for testing the difference between two sample means. This is because interval-ratio variables have a fixed and equal interval between values, and allow for meaningful mathematical operations like addition and subtraction, which are essential in calculating means and differences between means. Nominal and ordinal variables do not have this property, making them unsuitable for this type of analysis.

For Testing the Difference Between Two Sample Means, the Level