To assess the impact of test difficulty on persistence of effort,researchers plan to give one group of children relatively easy tests and another group more difficult tests.To reduce the chance that the children in one group are more intelligent than those in the other group,the researchers should make use of
A) random assignment.
B) the double-blind procedure.
C) naturalistic observation.
D) operational definitions.

Question

Quizplus · Accepted Answer

Random assignment ensures that each group is made up of individuals that are similar in all relevant characteristics, including intelligence. This will reduce the chance that one group is more intelligent than the other, allowing for a more valid assessment of the impact of test difficulty on persistence of effort. The other options (B, C, and D) are not relevant to this concern.

To Assess the Impact of Test Difficulty on Persistence of Effort,researchers