What is the primary weakness of a scale that adds two kilograms to everything it weighs?
A)poor test-retest reliability
B)low interrater reliability
C)the placebo effect
D)lack of validity

Question

Quizplus · Accepted Answer

The primary weakness of a scale that adds two kilograms to everything it weighs is lack of validity. Adding two kilograms to every weight does not accurately measure the true weight of an object or person, therefore it lacks validity.

What Is the Primary Weakness of a Scale That Adds