Jenkins and Dallenbach did a famous study on the phenomenon of retroactive interference in the 1920s, in which they found that getting a good sleep before an exam might not be a bad idea. Which of the following was true about their study?
A)they tested two large groups: one slept between study and recall, and the other stayed awake
B)they found a main effect for retention interval but not for whether or not the participants slept
C)the design was a 2x4 repeated measures factorial design
D)the subject variables was whether or not the participants were able to sleep; the manipulated variable was retention interval

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The Answer of Jenkins and Dallenbach did a famous study on the phenomenon of retroactive interference in the 1920s, in which they found that getting a good sleep before an exam might not be a bad idea. Which of the following was true about their study?
A)they tested two large groups: one slept between study and recall, and the other stayed awake
B)they found a main effect for retention interval but not for whether or not the participants slept
C)the design was a 2x4 repeated measures factorial design
D)the subject variables was whether or not the participants were able to sleep; the manipulated variable was retention interval

Jenkins and Dallenbach Did a Famous Study on the Phenomenon