Individual Assignments from the Text

Only available on StudyMode
  • Download(s) : 196
  • Published : June 27, 2012
Open Document
Text Preview
11. For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation: 2, 2, 0, 5, 1, 4, 1, 3, 0, 0, 1, 4, 4, 0, 1, 4, 3, 4, 2, 1, 0 Answer:

A) Mean = 2
B) Median = 2
C) Sum of squared deviations =-52
D). Variance = -2.47
E). Standard deviation = 1.57
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
Answer:
A) Mean = 1.361
B) Median = 1.3124
C) Sum of squared deviations = 0.07608920.0190223
D). Variance = 0.0190223
E). Standard deviation =0.1379213544
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
Answer:
A). Mean = 3.16667
B). Median = 3.25
D). Variance = (0.32660)^2 = 0.10667
E). Standard deviation = 0.32660
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. Answer:

The figures for the governors were 44, 36, 52, and 40 square feet. Gov's mean = 43 ; std = 6.83

The figures for the CEOs were 32, 60, 48, and 36 square feet. CEO's mean = 44 ; std = 12.65

(a) Figure the means and standard deviations for the governors and for the CEO's mean = 44 ; std = 12.65

CEOs.
Gov's mean = 43 ; std = 6.83
(b) Explain, to a person who has never had a course in statistics, what you have done: I have found the average for each and also determined if a measure of the spread of the data. The spread for CEO's is twice the spread for the Govs.

(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 This means that it is about the same, and the range is twice as wide for the CEO’s which indicates some CEO to have desks and some have much smaller desks.

21. Payne (2001) gave participants a computerized task in which they first see a face and then a picture of either a gun or a tool. The task was to press one button if it was a tool and a different one if it was a gun. Unknown to the participants while they were doing the study, the faces served as a “prime” (something that starts you thinking a particular way); half the time they were of a black person and half the time of a white person. Table 2–9 shows the means and standard deviations for reaction times (the time to decide if the picture is of a gun or a tool) after either a black or white prime. (In Experiment 2, participants were told to decide as fast as possible.) Explain the results to a person who has never had a course in statistics. (Be sure to explain some specific numbers as well as the general principle of the mean and standard deviation.) Mean Reaction Times (in Milliseconds) in Identifying

Guns and Tools in Experiments 1 and 2
Prime Black White Target M SD M SD Experiment 1

Gun 423 64 441 73 Tool 454 57 446...
tracking img