If a researcher reported for an independent-groups t-test that t(18)= 2.90,p

Question

If a researcher reported for an independent-groups t-test that t(18)= 2.90,p< .01,how many participants were there in the study?
A)18
B)20
C)10
D)9

Quizplus · Accepted Answer

The t-test reported that there were 18 degrees of freedom (df = n - 1) and a significant difference between groups at the .01 level. Looking up the corresponding t-value in a t-table with 18 df, the critical t-value is 2.878. Because the reported t-value (2.90) is greater than the critical t-value, it suggests that there were more than 18 participants in the study. The closest number of participants with a corresponding df of 18 is 20, so the best choice is B.

If a Researcher Reported for an Independent-Groups T-Test That T(18)=