Week3Psy315Practiceproblems

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PSY315 Week3 PRACTICE PROBLEMS CHAPTER 2

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 added up =42 divided by 21=(2 is the mean.)
0 0 0 0 0 1 1 1 1 1 2 2 2 3 3 4 4 4 4 4 5= 2 is the median
When subtracted by mean the numbers are; 0 0 -2 3 -1 2 -1 1 -2 -2 -1 2 2 2 -2 -1 2 1 2 0 -1 -2 When they are squared they are 0 0 -4 9 -1 4 -1 1 -4 -4 -1 4 4 4 -4 -1 2 1 4 0 -1 -4 added up they = 8 sum of squared deviations
8 divided by 21= 2.6 variances
(2.6 (2.6) = 6.76 standard deviation

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 added up =6,562 divided by 5= 1312.4 the mean. 1,361 is the median
When subtracted by mean the numbers are 200.4 67.4 -48.6 -59.6 -159.6
When they are squared the number are 14.1 8.2 6.9 7.7 12.6 added up they equal 49.5 sum of squared deviations) 5 divided by 49.5 = 9.9 is the variance.(9.9)(9.9)=98.01 standard deviation

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 added up = 19 divided by 6 =3.1mean. 2.6 3.0 3.2 3.3 3.4 3.5 (3.2 & 3.3 added =6.5 divided by 2 =3.25 median when subtracted from mean the numbers are 16 15.6 16.4 15.7 15.5 15.8 when squared they equal 4 3.9 4.0 3.9 3.9 3.9 added up they = 23.6 sum of deviations 23.6 divided by 6 = 3.9variance (3.9) (3.9)=15.21 standard deviation
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)