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?

10

Step-by-step explanation:

We know that the degree of freedom for two sample with sample sizes and is given by:-

If sample sizes are same , then   (1)

Given : An independent-measures study comparing two treatment conditions produces a t statistic with df = 18.

Then, from (1) , we have

Hence, the number of participants were in each of the samples =10

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