Please look at question 10, 11, and 12 and if I answer the correctly.

9. A distribution of N = 10 scores has u = 40 and G = 10. If another five individuals, all with scores of X = 40, are added to this distribution, what will happen to the mean and standard deviation-will each increase, decrease, or stay the same? Explain your answer. (3-points) Adding a constant to every score does not affect any of the distances, and therefore does not allange the standard deviation 10. The following population of scores made by a group of students in a psychology of learning course on a quiz. * 2 SS = 2x 2( Ex2)2 8 = 39. 429 144 8s = 571- kin 16 .5715 121 n - 1 10 10 00 ON . 100 SS = 571 - (61 ) 2 81 8 = 39. 429 52- 2.563 64 7 6 136 25 SS = 39. 429 5 = 6. 5715 61 a. Compute the standard deviation using the computational formula method (3-points) 1 1. 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 a. Range: 9 - 1 = 8 high - Low +1 (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)