The pursuit rotor is a test of perceptual-motor coordination. It involves a turntable with a disk about the size of a dime embedded in it. The participant is given a pointer and is asked to keep the...

The pursuit rotor is a test of perceptual-motor coordination. It involves a turntable with a disk about the size of a dime embedded in it. The participant is given a pointer and is asked to keep the pointer on the disk while the turntable is rotating. The dependent variable is the percentage of time on each trial that the participant keeps the pointer on the disk. Learning on this task is linearly related to trials over many periods of practice, and the task generally takes a long time to master. A researcher wants to study the influence of time of day on the performance on this task with four different times (10 A.M., 2 P.M., 6 P.M., and 10 P.M.). The participants will receive a constant number of trials under each of the four conditions, and participants will be tested in one condition per day over four consecutive days.

A What design is being used for the time-of-day variable in this experiment?

B Prepare a Latin Square to balance practice effects across the conditions of this experiment.

C The researcher decides to use all possible orders to balance practice effects. The researcher assigns each participant to one of the 24 possible orders of the conditions. Which experimental design is included when you look only at the first condition to which each participant was assigned?

D How could the researcher test whether differential transfer occurred when all possible orders were used to balance practice effects?