Interstate conflict is a threat to world security about which the global community should be concerned now and in future decades

A correlation coefficient of __________ in a measure is generally seen as very reliable

a. .45 b. .60 c. .80 d. .75

In nonequivalent control group designs, the comparison group is selected by using ______.

A. matching and randomization B. stratified sampling C. individual and aggregate matching D. convenience