A Research Study Finds That 40-Year-Olds Are Better Able to Solve

Multiple Choice

A research study finds that 40-year-olds are better able to solve math problems than 80-year-olds. It is suspected that the differences in problem-solving ability result from the fact that 80-year-olds had fewer opportunities to study math and did not have access to calculators or computers. If true, the study has revealed ________.

A) experimenter bias
B) a placebo effect
C) confirmation bias
D) cohort differences