This threat of internal validity comes from changes in measuring instruments or observers.
A) Testing
B) Maturation
C) Subject selection
D) History
E) None of the above

Question

Quizplus · Accepted Answer

The correct term for the threat described is "Instrumentation," which is not listed among the options provided. Instrumentation refers to changes in the calibration of a measuring instrument or changes in observers that might affect measurements.

This Threat of Internal Validity Comes from Changes in Measuring