In Katia's remedial mathematics study,she collected pretest data from a group of participants.She divided the participants into three groups.One group received no treatment,one group received instruction by a teacher-delivered intervention,one group received peer tutoring on the same problems.After the intervention she tested their math skills.With which validity threat should Katia be most concerned?
A)Maturation
B)Testing
C)Instrumentation
D)Attrition

Question

Quizplus · Accepted Answer

Katia should be most concerned with the validity threat of testing, as the pretest data collected may have influenced the participants' performance on the post-intervention test. This could be due to factors such as practice effects or familiarity with the test format, rather than the effectiveness of the interventions.

In Katia's Remedial Mathematics Study,she Collected Pretest Data from a Group