One of the most powerful ways to control for testing effects

One of the most powerful ways to control for testing- effects is to* O Randomly assign participants O Counterbalance O Test on different days None of the answers provided are correct

Solution

Option (a)

Random assignment reduces any type of biases. It removes any doubt on the effects of test. Therefore, option (a) is correct. When we are testing there are variables involved. To control testing effects test on different days is not a solution because it does not guarantee bias free results.