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

Question

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Random assignment will help ensure that any individual differences in intelligence or other factors that might impact persistence of effort are equally distributed across the two groups. This will make it more likely that any differences in persistence of effort can be attributed to the different levels of test difficulty. The other options (B, C, and D) are not directly relevant to controlling for individual differences in intelligence.

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