Question

Which of the following t test results has the greatest chance of statistical significance?

Answer 1

  t(28) = 1.70
       t(14) = 1.70
       t(18) = 1.70
       t(10) = 1.70

Answer 2

It should be t(28) which has the highest degrees of freedom. And, the calculated values above are the same, so the only variable changing is the degrees of freedom. As the degrees of freedom increase, the t-value in the t table decreases. So, the difference between two means is significant if the calculated t value exceeds the value in the table.