questions only 34-37 For questions 32 t o 45, do not use SPSS, Is ophidiophobia

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questions only 34-37

For questions 32 t o 45, do not use SPSS, Is ophidiophobia (fear of snakes) specific to the size of a snake or will is sizes evoke similar levels of anxiety? Twelve participants were recruited for the study. Four were randomly assigned to view either a small (1 foot long) snake, a medium (I-2 foot long) snake, or a large (-2 foot long) sake s mnutes. The level of anxiety, measured by heartbeats per minute, was recorded for each participant. Is there a significant difference in anxiety towards size of snake Small Medium Large 60 68 72 72 75 80 81 83 84 93 32. What is the correct null hypothesis for the study? b. HaIA # plj for some i, j combination: at least one group mean is different 33. What is the correct alternative hypothesis for the study? d. Ha: », for some i, j combination; at least one group mean is different 34. Calculate the treatment effect for group 1: a 35. Calculate the treatment effect for group 2a2- 36. Calculate the treatment effect for group 3: a3 37. What are the degrees of freedom between groups? dfB 38. What are the degrees of freedom within groups? d fw 39. What is the F critical value with a.05 level of significance? Ferit

Explanation / Answer

Mean of group 1 = (60 + 68 + 72 + 77)/4 = 69.25

Mean of group 2 = (72 + 75 + 80 + 81)/4 = 77

Mean of group 3 = (83 + 84 + 88 + 93)/4 = 87

Overall mean = (69.25 + 77 + 87)/3 = 77.75

Hence,

32. Option A

33. Option D

34. Treatment effect for group 1 = 69.25 - 77.75 = -8.5

35. Treatment effect for group 2 = 77 - 77.75 = -0.75

36. Treatment effect for group 3 = 87 - 77.75 = 9.25

37. Degrees of freedom between groups = 3 - 1 = 2

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