Karen erroneously believes that her test grades are negatively correlated with the amount of time she studies for her tests. Research on illusory correlation suggests that she is especially likely to notice instances in which:

poor grades follow lengthy study and good grades follow brief study.

Explanation:

Illusory Correlation is a term which refers to a phenomenon in which an individual believes that a relationship exists between two factors when in reality no such relationship exists. Which in this case, based on this information, Karen is likely to notice instances in which poor grades follow lengthy study and good grades follow brief study.

the right answer is a