70 female students were randomly assigned to one of two math course educational formats. students in group a were assigned to study math in an all female course. students in group b were asked to study first amongst all female colleagues and then in a mixed gender environment. the outcome (the response) is the sat math test scores at the conclusion of the semester (higher scores indicates better performance). the sat tests were administered by professionals who did not know the research question and were blind to the groups used in the experiment. here are the summary statistics of the sat data: which of the following justifies why we can safely use the two-sample t-test in this case? (a) the two samples are independent and both sample sizes are larger than 30.(b) the two samples are independent.(c) the two samples are both larger than 30.(d) the medical expert did not know which group each participant was assigned to and was blind to the hypotheses of the study(e) all of the above.