Mental rotation times will be measured in a fashion similar to that described by Shepard and Meltzer (1971). After a block of practice trials, each student will receive 12 trials with a non- rotated comparison stimulus (0 or no rotation). Then, students will be tested for 12 trials with a comparison rotated at a 60 degree angle, followed by 12 trials with a comparison rotated at a 120 degree angle. Finally, they will receive 12 trials with a comparison rotated at a 180 degree angle. The angles will always be tested in this same order. A) What is the independent variable in this experiment? B) What variable is confounded with the independent variable? Explain why it is a confounded variable. C) The present experiment is not properly counterb
Mental rotation times will be measured in a fashion similar to that described by Shepard and Meltzer (1971). After a block of practice trials, each student will receive 12 trials with a non- rotated comparison stimulus (0 or no rotation). Then, students will be tested for 12 trials with a comparison rotated at a 60 degree angle, followed by 12 trials with a comparison rotated at a 120 degree angle. Finally, they will receive 12 trials with a comparison rotated at a 180 degree angle. The angles will always be tested in this same order.
A) What is the independent variable in this experiment?
B) What variable is confounded with the independent variable? Explain why it is a
confounded variable.
C) The present experiment is not properly counterbalanced. Explain how the lack of counterbalancing could bias the results. Assume in your answer that reaction times get faster over trial blocks with practice, and say whether you would expect the slope of the real
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