Statistics

Solution is available here for U$30

Written responce for each.

12. For the following scores, find the (a) mean, (b) median, (c) sum of squared

deviations, (d) variance, and (e) standard deviation:

1,112; 1,245; 1,361; 1,372; 1,472

 13. For the following scores, find the (a) mean, (b) median, (c) sum of squared

deviations, (d) variance, and (e) standard deviation:

3.0, 3.4, 2.6, 3.3, 3.5, 3.2

16. A psychologist interested in political behavior measured the square footage of the

desks in the official office of four U.S. governors and of four chief executive officers

(CEOs) of major U.S. corporations. The figures for the governors were 44, 36,

52, and 40 square feet. The figures for the CEOs were 32, 60, 48, and 36 square

feet. (a) Figure the means and standard deviations for the governors and for the

CEOs. (b) Explain, to a person who has never had a course in statistics, what you

have done. (c) Note the ways in which the means and standard deviations differ,

and speculate on the possible meaning of these differences, presuming that they

are representative of U.S. governors and large corporations’ CEOs in general.

14. On a standard measure of hearing ability, the mean is 300 and the standard deviation is 20. Give the Z scores for persons who score (a) 340, (b) 310, and

(c) 260. Give the raw scores for persons whose Z scores on this test are (d) 2.4,

(e) 1.5, (f) 0, and (g)

.

15. A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability test, the mean for people in general is 0 and the standard deviation is 5. Which is this person’s stronger ability: verbal or quantitative? Explain your answer to a person who has never had a course in statistics.

22. Suppose you want to conduct a survey of the attitude of psychology graduate students studying clinical psychology toward psychoanalytic methods of psychotherapy.

One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it. (a) What kind of sampling method is this? (b) What is a major limitation of this kind of approach?

25. You are conducting a survey at a college with 800 students, 50 faculty members, and 150 administrators. Each of these 1,000 individuals has a single listing in the campus phone directory. Suppose you were to cut up the directory and pull out one listing at random to contact. What is the probability it would be (a) a student, (b) a faculty member, (c) an administrator, (d) a faculty member or administrator, and (e) anyone except an administrator? (f) Explain your answers to someone who has never had a course in statistics.