The following results describe a two-sample t-test for differences for the cholesterol (HDL) levels of a group of adults. The groups are divided with a bivariate defined by gender. If a difference exists, is there enough information below to determine why there is a difference?

t-Test: Two-Sample Assuming Unequal Variances female male Mean 261.302 239.290 Variance 4236.571 1830.333 Observations 96 207 Hypothesized Mean Difference 0 df 134 t Stat 3.024 P(T