An online math tutor service would like to claim that the average time spent taking a standardized test after students go through tutoring is less than the average time spent before going through tutoring. A simple random sample of students takes a pre-test, then goes through tutoring and takes a post-test. Results of the sample are shown below. Before After What are the population parameters? Mean 82.333 74.944 Variance 110.118 199.820 Observations 18 18 Pick Pearson Correlation 0.727 Hypothesized Mean Difference dif 17 Is the two-sample hypothesis test a paired t-test or an unpaired t-test? t Stat -3.227 P(T