If subjects in the experimental group are always administered the treatment in the afternoon and subjects in the control group are always administered the treatment in the morning, then the study is said to experience:
A) matching.
B) repeated measures.
C) constant error.
D) demand characteristics.

Question

Quizplus · Accepted Answer

This scenario describes a constant error, where a consistent and systematic difference in conditions (time of day) between the experimental and control groups could influence the outcome of the study, potentially confounding the results.

If Subjects in the Experimental Group Are Always Administered the Treatment