Question 5 [Mandatory] {12 points} Which of the following {mav he more than one answer} is a requirement for using a pooled twovsam ple testiI C] Each population must be near normally.' distributed. C] Sample sizes must be the same. C] Significance level must he 5%. C] Population standard deviations for each group must be the same. Question 6 [Mandatory] {15 points] The mean final exam score of 35 students who had calculus in high school is ??.3 {with a standard deviation of 6.3]; while the mean exam score of 23 students who had not had calculus in high school is as {with a standard deviation of 14}. In a test comparing the two means, what would he the appropriate number of degrees of freedom