Evaluating Operational Definitions If a team of observers gradually changes its criteria for judging the aggressiveness of children's play as they became more familiar with the procedure, the study's internal validity could be jeopardized by a(n) _____ threat.
A)history
B)instrumentation
C)statistical regression
D)testing

Question

Quizplus · Accepted Answer

The change in criteria for judging aggressiveness of children's play indicates a change in the measurement tool or instrumentation which could lead to systematic measurement error or bias, jeopardizing the internal validity of the study. The other answer choices are not relevant to the situation described.

Evaluating Operational Definitions If a Team of Observers Gradually Changes