Name Psych 10: Exam 2 Computational Questions Required Questions 1. With a of 350 and x =75, N=25, what is the probability of selecting a sample mean between 310 and 360? Calculate probability and draw graph. 2. You measure the happiness of a sample of medical students thinking the medical school may lower their happiness compared to a typical graduate student (typical graduate student =45, x=10.12). You obtain these scores: 44 55 39 20 24 38 36 24 32 a) Is this a one-tailed or two-tailed test? Explain your answer. b) What are the statistical hypotheses, H. and Ha? (use symbols as you learned in text). c) Compute Zobt d) With =.05, what is Zcrit? e) What should you conclude about happiness for the medical students compared to other students? Justify and explain your answer. 3. You would like to know if a child's absence from school (Y) can be predicted by knowing their hours spent on social media (X). You survey 6 children and here are the results: Participant SM Time (X) Absence (Y) 1 2 3 2 1 4 3 1 2 4 3 5 5 7 8 6 5 9 Hint: some numbers provided for you: [X=19, Y=31, X=89, Y=199, [XY=128 Extra Credit a. Compute the statistic that describes the relationship between X and Y. What can we conclude from the results? Describe in words - what did the researcher learn? b. What is the proportion of variance accounted for? Calculate and include an interpretation of the value. What does it tell us about the relationship between the variables? a. What is the linear regression equation? b. For Q3 above, calculate y intercept and slope. C. For Q3 above, what absence score would you predict for a child with a social media score of 4?