A researcher is using a twotailed hypothesis test with a 05

A researcher is using a two-tailed hypothesis test with a = .05 to evaluate the effect of a treatment. If the boundaries for the critical region are t =

Solution

If alpha = .05 and there are two tails, there is .025 in each tail. (.05/2 = .025)

Looking up on the t table under the .025 column, you find 2.080 at a df of 21.

Since the df is the sample size minus 1, the sample size must have been 22.

answer: 22