Baltes suggests that intelligence should measure

Each of the following is considered by your text to be one of the five common sources of frustration EXCEPT ______

a. anxiety c. losses b. lack of resources d. discrimination

The advantage of including two treatment groups receiving the treatment at different times in a replicated interrupted time series design is that

a. the control group is not necessary. b. the effect of a possible history threat to internal validity is more apparent. c. you avoid have to engage in pretest-posttest measurements. d. you can use counterbalancing to avoid maturation problems.