When would you conclude there is a causal effect in an exper

When would you conclude there is a causal effect in an experiment?

a. When the systematic variance is high and error variance is low.

b. When both systematic and error variance are low.

c. When the error variance is greater than the systematic variance.

d. When the error variance has a positive effect on the mean of the experiemental group.

Solution

c. When the error variance is greater than the systematic variance.