Please review #10, 11 and 12 if my answers are right.

10. The following population of scores made by a group of students in a psychology of learning course on a quiz. X * 2 SS = 2x2 ( Ex 2) 2 12 144 8 = 39. 429 11 16.5715 10 121 n - 1 100 SS = 571 - ( 61)2 81 8 = 39. 429 52- 2.563 6 4 7 36 6 w 25 SS = 39. 429 52 = 6. 5715 61 a. Compute the standard deviation using the computational formula method (3-points) 11. For the following set of data, find the range, interquartile range, and the semi-interquartile range. Scores: 3, 5, 3, 5, 9, 4, 6, 5, 1, 4, 9,2 9 - 1 = 8 high - Low + 1 a. Range: (1-point) b. IQR: 215 (2-points) 9 - 1 +1 c. SIQR: 1. 25 (1-point) 9 12. The following hypothetical data were obtained from a random sample of freshman and seniors. They represent attitude scores toward the statement "Handguns should be registered." The investigator was interested in the variability of attitudes among freshman and seniors on this question. Compute the standard deviation for each. Freshman Seniors 7, 2, 6, 2, 4, 9, 5, 6, 1, 3 9, 1, 5, 9, 6, 4, 3, 8, 3, 3 a. What is the standard deviation for freshman? 2 . 5 5 (2-points) b. What is the standard deviation for seniors? 2 . 8 (2-points) c. Which sample of students is most consistent in their attitudes toward handguns? Freshman(1-point)