Aresearcher has participants rate the likability of a sexually promiscuous person described in a vignette as being male (n = 20) or female (n = 12). the mean likability ratings in each group were 4.0. if the null hypothesis is that there is no difference in likability ratings, then do likability ratings differ at a 0.05 level of significance? a. yes, this result is significant, p < 0.05. b. no, this result is not significant, t(30) = 0. c. no, this result is not significant, t(30) = 1.00. d. there is not enough information to answer this question, because the variance in each sample is not given.