An independent-measures study comparing two treatment conditions produces a t statistic with df = 18. If...
An independent-measures study comparing two treatment conditions produces a t statistic with df = 18. If the two samples are the same size, how many participants were in each of the samples?
a) 9
b) 10
c) 19
d) 20
Homework Answers
df = n1+n2-2
==> df = n+n-2 = 2n-2
==> n = (18+2)/2 = 10
10 samples in each
b) 10
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