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.

1. why is a frequency distribution useful? it allows researchers to see the "shape" of the data. it tells researchers how often the mean occurs in a set of data. it can visually identify the mean. it ignores outliers. 2. the is defined by its mean and standard deviation alone. normal distribution frequency distribution median distribution marginal distribution 3. approximately % of the data in a given sample falls within three standard deviations of the mean if it is normally distributed. 95 68 34 99 4. a data set is said to be if the mean of the data is greater than the median of the data. normally distributed frequency distributed right-skewed left-skewed