History is an event beyond the researcher's control

Several variables are associated with longer life expectancy

One way to remove the possible effects of per-capita income as a variable is to examine only countries with similar levels of income per capita. This is an example of using: a. the comparative cases method. b. the multiple cases method. c. a control variable. d. quantitative comparative analysis.

Which of the following statements regarding British political parties is true?

a. The main parties have similar platforms. b. There is weak party identification amongst voters. c. Voters tend to vote for parties rather than individuals. d. Campaign items feature candidate's names rather party identification.