An important measure to decrease threats to internal validity in an experimental study is to
A) apply the intervention consistently.
B) improve the precision of measurement methods.
C) increase the sample size.
D) randomly assign subjects to study groups.

Question

Quizplus · Accepted Answer

An important threat to internal validity is any concern about subject selection and assignment to groups.Randomly assigning subjects to treatment and control groups helps to minimize this threat.Consistent application of the intervention and improved precision of measurements help minimize threats to statistical conclusion validity.Increasing sample size minimizes threats to external validity.

An Important Measure to Decrease Threats to Internal Validity in an Experimental