A resarcher would like to conduct a study comparing two trea

A resarcher would like to conduct a study comparing two treatment conditions with 30 individuals measured in each treatment. How many participants are needed for a REPEATED-MEASURES design,and what is the DF?

Solution

2 treatment conditions hence k=2
30 individuals hence n=30

number of participants required N = 2*30 = 60

degree of freedom:
Treatment = k-1 = 1
error = N-k = 58
total = N-1 = 59