For a repeatedmeasures experiment comparing two treatment co

For a repeated-measures experiment comparing two treatment conditions, the t statistic has df = 10. How many participants were used in the entire study?

Solution

As this is a matched-pairs experiment, then

df = n - 1

or

n = df + 1

Thus,

n = 10 + 1

n = 11 [ANSWER, 11 participants]