Chapter 10 Study Guide

Define Selection:

Groups differ at pretest.

Define Selection–attrition:

Groups lose participants differently over time

Define Selection–maturation:

Groups change differently due to natural development.

Define Selection–instrumentation:

Changes in measurement affect groups differently.

Define Selection–testing:

Pretests affect groups differently.

Define Selection–regression-artifact:

Groups with extreme scores regress differently toward the mean.

Define Selection-history:

Different groups experience events differently over time.

Define Differential-history:

Groups encounter events differently that influence outcomes.

Which is the primary internal validity threat in an interrupted time-series design?

A) Selection–attrition
B) History
C) Regression artifact
D) Differential history at cutoff

History

Which internal validity threat is most relevant but rare in a regression-discontinuity design?

A) Selection–testing
B) Differential history at the cutoff
C) Selection–maturation
D) History for the entire group

Differential history at the cutoff