To assess the degree to which one is right-handed or left-handed, you would most likely use the

Stratified random sampling that tries to ensure an equal number of units per group is also called ____ random sampling

a. modal b. disproportionate c. independent d. proportional

Haier believes his research shows that higher intellectual performances are related to

a. greater brain efficiency. b. having larger corpus callosums. c. having "harder working" brains. d. all of these.