One reason that repeated measures factorial designs are not used more often is because _____
a. presenting different treatments to the same participants creates demand characteristics
b. participants are usually bored very early and stop paying attention to the stimuli
c. it is impossible to assess the influence of carryover effects statistically
d. they typically require three to four times the number of participants as a between subjects factorial design requires
A
The manipulation is often easy for participants to detect if they experience multiple treatment levels during an experiment. This creates demand characteristics.
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