In general, research hypotheses need to be __________ and __________

If differences in heredity were unimportant for differences in IQ scores, what should we expect?

a. IQ correlations should be equally high for monozygotic and dizygotic twins. b. IQ correlations should be higher for dizygotic than monozygotic twins. c. IQ correlations should be higher for monozygotic than dizygotic twins. d. IQ correlations should be higher for twins reared apart than reared together.

Which of the following is NOT a step in a psychological experiment?

a. varying a condition you believe might affect behavior b. creating two similar groups of subjects c. administering the same independent variable to both groups d. recording whether the condition has any effect on behavior