For a single-sample t-test the t(17) = 2.90, p<.02, how many were in the study?

Here is a hint:

The degrees of freedom for a single sample t-test is (n-1).

10

To determine the number of participants in a study given the information of a single-sample t-test, we need to look at the degrees of freedom (df) associated with the t-value provided. In this case, the degrees of freedom are indicated as t(17), where 17 represents the df.

The degrees of freedom for a single-sample t-test can be calculated by subtracting 1 from the total number of participants in the study. So, to find the number of participants, we add 1 to the degrees of freedom:

Number of participants = Degrees of freedom + 1

In this case, we have t(17), indicating that the degrees of freedom are 17. Thus, the number of participants in the study is:

Number of participants = 17 + 1 = 18

Therefore, there were 18 participants in the study.