Raina has been studying for the sats, and every night for a week she has taken the same simulated sat that comes in a study book. her scores have improved, but on the actual sat (a different set of questions) she scores 400 points lower than on her study tests. it turns out that raina's scores were improving due to effects. select one: a. cohortb. placeboc. practiced. confounding

C - practiced Practice effects are effects that alter your score on a test as a result of taking the test repeatedly. When you take a test multiple times, your score should increase because you ideally improve with practice. Thus, Raina's score on the study tests was improving because of the practice effect. However, the real SAT which included a different set of questions was not impacted by the practice effect.

Read your textbook to answer that question