Match List - I with List - II.

List - I List - II

(Threats to Internal Validity) (Description)

A. Maturation threat I. When participants' behaviour changes as a function of having been tested previously

B. Attrition threat II. When some event outside the research project affects participants systematically

C. History threat III. Occurs because of short or long term changes in a participant because of psychological changes like boredom, fatigue etc.

D. Testing threat IV. When participants drop out of a study, leading to a change in the nature of the sample

Choose the correct answer from the options given below:

Question

List - I		List - II
(Threats to Internal Validity)		(Description)
A.	Maturation threat	I.	When participants' behaviour changes as a function of having been tested previously
B.	Attrition threat	II.	When some event outside the research project affects participants systematically
C.	History threat	III.	Occurs because of short or long term changes in a participant because of psychological changes like boredom, fatigue etc.
D.	Testing threat	IV.	When participants drop out of a study, leading to a change in the nature of the sample