When a change in the dependent variable could be due to changes in how the dependent variable was measured, _________ is a threat to internal validity.
A)attrition
B)testing
C)diffusion of treatment
D)instrumentation

Question

Quizplus · Accepted Answer

Instrumentation refers to changes in how a dependent variable is measured over the course of a study, which can threaten its internal validity as it is unclear whether any changes in the variable are due to the treatment or due to changes in measurement. Attrition refers to participants dropping out of a study, testing refers to repeated measurement of the same variable influencing results, and diffusion of treatment refers to the spread of a treatment or intervention to participants who were not intended to receive it.

When a Change in the Dependent Variable Could Be Due