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PSYCH/625 Version 2 Week Five University of Phoenix Material

Advanced psychological assessment and research methods

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    Time to Practice – Week Five PSYCH/625 Version 2 1 Copyright © 201 4 by University of Phoenix . All rights reserved. 7 PSYCH/625 Version 2 Week Five University of Phoenix Material Time to Practice – Week Five Complete Parts A, B, and C below. Part A Some questions in Part A require that you access data from Statistics for People Who (Think T hey) Hate Statistics . This data is available on the student website under the Student Text Resources link. 1. Use the following data to answer Questions 1a and 1b. Total no. of problems correct (out of a possible 20) Attitude toward test taking (out of a possible 100) 17 94 13 73 12 59 15 80 16 93 14 85 16 66 16 79 18 77 19 91

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    Time to Practice – Week Five PSYCH/625 Version 2 2 Copyright © 201 4 by University of Phoenix . All rights reserved. a. Compute the Pearson product - moment correlation coefficient by hand and show all your work. X Y (Xi - Xbar) (Yi - Ybar) (Xi - Xbar)^2 (Yi - Ybar)^2 (Xi - Xbar)*(Yi - Ybar) 17 94 1.4 14.3 1.96 204.49 20.02 13 73 - 2.6 - 6.7 6.76 44.89 17.42 12 59 - 3.6 - 20.7 12.96 428.49 74.52 15 80 - 0.6 0.3 0.36 0.09 - 0.18 16 93 0.4 13.3 0.16 176.89 5.32 14 85 - 1.6 5.3 2.56 28.09 - 8.48 16 66 0.4 - 13.7 0.16 187.69 - 5.48 16 79 0.4 - 0.7 0.16 0.49 - 0.28 18 77 2.4 - 2.7 5.76 7.29 - 6.48 19 91 3.4 11.3 11.56 127.69 38.42 Sum 156 797 3.55271 E - 15 - 2.84217 E - 14 42.4 1206.1 134.8 Averag e 15. 6 79. 7 3.55271 E - 16 - 2.84217 E - 15 4.24 120.61 13.48 =13 4 .8/SQRT(4 2 .4*120 6 . 1) = 0.596

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    Time to Practice – Week Five PSYCH/625 Version 2 3 Copyright © 201 4 by University of Phoenix . All rights reserved. b. Construct a scatterplot for these 10 values by hand. Based on the scatterplot, would you predict the correlation to be direct or indirect? Why? Clearly an upward trend is observed between X and Y implying that there is a positive linear relationship between X and Y. that is as the value of X increases, the value of Y also increases. Thus there is a direct correlation between X and Y.

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    Time to Practice – Week Five PSYCH/625 Version 2 4 Copyright © 201 4 by University of Phoenix . All rights reserved. 2. Rank the following correlation coefficients on strength of their relationship (list the weakest first): +.71 +.36 – .45 .47 – .62 Rank ed correlation coefficients on strength of their relationship is shown below. - 0.62, - 0.45, +0.36, +0.47. +0.71 3. Use IBM ® SPSS ® software to determine the correlation between hours of studying and grade point average for these honor students. Why is the correlation so low? Hours of studying GPA 23 3.95 12 3.90 15 4.00 14 3.76 16 3.97 21 3.89 14 3.66 11 3.91

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    Time to Practice – Week Five PSYCH/625 Version 2 5 Copyright © 201 4 by University of Phoenix . All rights reserved. 18 3.80 9 3.89 Correlations hours_stud ying gpa hours_study ing Pearson Correlation 1 .144 Sig. (2 - tailed) .691 N 10 10 gpa Pearson Correlation .144 1 Sig. (2 - tailed) .691 N 10 10 Correlation coefficient = 0.144. This implies there is no correlation between hours of studying and GPA. That is number of hours does not depend on GPA.

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