A researcher is evaluating the changes in performance that occur during a 6-week training program.Participants are observed at the beginning and at the end of the program and the researcher rates each individual's level of performance.If the researcher's standards for rating performance change from the first observation to the last,then the internal validity of the study is threatened by
A)history.
B)instrumentation.
C)maturation.
D)statistical regression.

Question

Quizplus · Accepted Answer

Instrumentation refers to changes in measuring instruments or procedures used in data collection, which can affect the consistency of the results. In this case, the researcher's standards for rating performance have changed, which means that the same participants may receive different ratings at the beginning and end of the study, making it difficult to draw valid conclusions about the effectiveness of the training program.

A Researcher Is Evaluating the Changes in Performance That Occur