answers

Chapter 9 Activity Instructions: Show all work when applicable. This can be done online or by hand. Once completed, upload activity to Canvas as a Word or PDF file or take a picture if done by hand. 1. What is the difference between a one-sample t test and a related-samples test? How are they alike? 2. Name three research questions that could be addressed using a related-samples f test. 3. What are difference scores and why do we calculate them? 4. Why is the null hypothesis for a related-samples t test always pp = 07 5. Aresearcher is interested in testing whether explaining the processes of statistics helps increase trust in computer algorithms. He wants to test for a difference at the = .05 level and knows that some people may trust the algorithms less after the training, so he uses a two-tailed test. He gathers pre-post data from 35 people and finds that the average difference score is Mp = 12.10 with a standard deviation of sp = 17.39. Conduct a hypothesis test to answer the research question. 6. Decide whether you would reject or fail to reject the null hypothesis in the following situations: Mp = 3.50, s5 = 1.10, n = 12, a = .05, two-tailed test 95% CI = (0.20, 1.85) t=2.98, t* = -2.36, one-tailed test to the left 90% Cl = (-1.12, 4.36) oo ow 7. Calculate difference scores for the following data: Time 1 Time 2 Xo 6l 83 75 89 91 98 83 92 74 80 82 88 98 98 e 77 69 88 76 79 91 91 70 80 8. Researchers investigated the extent to which Japanese immigrant mothers encouraged their infants to interact with them or with objects in their environment (such as toys). The researchers observed 8 mothers with their infants. Data are the number of times that mothers encouraged their infants to engage with them or with objects during the observation period. Test the hypothesis at the a = .05 level using the four-step hypothesis testing procedure. With Mom With Objects 15 40 12 47 T 1 32 10 50 20 35 28 45 12 42 15 32