DrMacIlhenny Wishes to Explore Gender Differences in Language Arts Skills

Multiple Choice

Dr.MacIlhenny wishes to explore gender differences in language arts skills among elementary school students.She suspects,however,that gender differences in scores on language arts tests may be influenced by sex differences in the number of hours that students spend studying and doing homework each week.Which of the following research strategies should she pursue if she wishes to attribute any gender differences she finds specifically to differences in language ability?

A) She should match each boy spending a given number of hours studying each week with a girl spending the same number of hours studying each week.
B) She should manipulate hours of studying or homework as an independent variable.
C) She should hold hours of studying or homework constant.
D) She should randomly select the samples of girls and boys used in the study.