In an ABA design, the null hypothesis states that _____
a. there is no difference between the mean performance during A and B
b. there is an increase in performance from A to B and then a decrease from B back to A
c. performance during B is lower than performance during A
d. there is no difference between the groups that get A and the groups that get B
A
The ABA design is a repeated measures design. The null hypothesis states that there will be no differences in performance among any of the treatment groups.
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