Part IV: Choosing the Right T-Test & Writing Hypotheses Should you use a one-sample, independent sample, or paired sample t-test for each of the research questions below (assume two-tailed for all tests)? Once you have decided, write your null and alternative hypotheses. A track coach is trying to figure out how to motivate her team to run faster. She divides the team into two groups, and gives one group positive feedback ("you're doing great, but I need you to pick up the pace") and the other group negative feedback ("you need to do better, so I need you to pick up the pace"). At the next track meet, she compares the two groups' results. 36) Which test? 37) HO: 38) H1: We want to see if exercise can help memory in adults with early onset Alzheimers. We test the memory of 50 adults, have them participate in a walking group for 30 minutes a day for a month, and then re-test their memory at the end of the month to see if their memories improved. 39) Which test? 40) HO: 41) H1: The average US high school student plays 2 instruments. We survey our class about how many instruments we play, to see if our sample is made up of average musicians (or, perhaps, we are above average!). 42) Which test? 43) HO: 44) H1