A professor wanted to demonstrate the power of using examples as a study strategy. She asked students to study vocabulary flashcards for either 5 or 30 minutes. Students were randomly assigned to use rote memorization or to create personal, real-world examples. The number of vocabulary words remembered correctly during a quiz was measured. What are the is the interaction between time and study strategy?

5 Minutes 30 Minutes

Memorizing 5 9

Creating Examples 6 15

a. There is a qualitative interaction between study strategy and time.

b. There is a quantitative interaction between study strategy and time.

c. There is no interaction between the variables.

d. There is both a quantitative and qualitative interaction between the study strategy and time.