I desperately need help with 12. I am doing the problems but I am afraid I am doing something wrong.

12. For each of the following means and standard deviations, calculate the upper and lower limits (edge.sagepub.com/gau3e) that contains data of the middle two-thirds of the distribution. from the 2007 CSCP. This data set contains three variables. For the variable yearsinoffice, a. x = 6.00, sd = 1.50 which measures the number of years chief b. x = 14.00, sd = 3.40 prosecutors have held their positions, use SPSS c. x = 109.32, sd = 14.98 to obtain the range, the standard deviation, and the variance. 13. For each of the following means and standard deviations, calculate the upper and lower 18. Using Census of State Prosecutors for Chapter 5.sav, limits of the middle two-thirds of the use SPSS to obtain the range, standard distribution. deviation, and variance of the variable a. x = 63.10, sd = 18.97 assistants, which shows the number of full-time b. x = 1.75, sd = .35 assistant prosecutors employed by each office. c. x = 450.62, sd = 36.48 19. Using Census of State Prosecutors for Chapter 5.sav 14. Explain the conceptual problem with the and the variable felclosed, which captures the variance that is the reason why the standard number of felony cases each office closed deviation is generally used instead. in 2007, use SPSS to obtain the range, the standard deviation, and the variance