Robb carefully designed a study to test a method for reducing test anxiety among students.On the day he conducts his post-test,a broken water main nearby results in jack hammering and other construction sounds that are seem to be distracting research participants.Robb's ability to detect differences among his groups may have been compromised by ____.
A)low reliability of the measure
B)random heterogeneity of participants
C)poor reliability of treatment implementation
D)random irrelevancies in the setting

Question

Quizplus · Accepted Answer

The presence of the distracting construction sounds is a random irrelevancy in the setting that could have affected all groups and compromised Robb's ability to detect differences among them. It is not related to the reliability of the measure, random heterogeneity of participants, or poor reliability of treatment implementation.

Robb Carefully Designed a Study to Test a Method for Reducing