Hand-signature condition: (M = 12.89, SD = 3.98), t (27) = - 0.14, p = 0.88

E-signature condition: (M = 14.97, SD = 5.05), t (30) = 2.17, p = 0.03

The results indicate that there is a statistically significant effect in the -signature condition. What additional information, if any, would we need to determine if this significant effect is a large or important one?

a. We would not need additional information; the fact that it is statistically significant tells us that it's important.

b. We would need to know the statistical power for this study.

c. We would need to know the effect size, Cohen's d, associated with this test statistic.

d. We would need to know the standard error used to calculate this test statistic.