_________ items should be used to measure constructs in a survey

An experiment is a test of the

A) Causal relationship between two variables. B) Difference between existing groups. C) Correlation between two variables. D) Natural flow of behavior.

The ______ is a measure of the number of parties that win seats.

A. effective number of judicial parties B. effective number of parties C. effective number of electoral parties D. effective number of legislative parties