In general, if the variance of the difference scores increases, then the value of the t statistic will .
a. increase (move farther toward the tail of the distribution).
b. decrease (move toward 0 at the center of the distribution).
c. stay the same - the t statistic is not affected by the variance of the difference scores.
d. may increase or may decrease. There is no consistent relationship between variance and the size of the t statistic.