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 Mean 79.278 75.556 What are the population parameters? Variance 126.448 125.203 Observations 18 Pick Pearson Correlation 0.521 Hypothesized Mean Difference 0 df 17 Is the two-sample hypothesis test a paired t-test or an unpaired t-test? t Stat -1.438 P(T