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 18 Pick Pearson Correlation 0.521 Hypothesized Mean Difference df 17 Is the two-sample hypothesis test a paired t-test or an unpaired t-test? t Stat -1.438 P(T