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PSYCH/625 Version 1 Time to Practice � Week Five University of Phoenix Material

Week five material for a psychology course.

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    Time to Practice – Week Five PSYCH/625 Version 1 1 Copyright © 2013 by University of Phoenix . All rights reserved. PSYCH/625 Version 1 Time to Practice – 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 n o. of p roblems c orrect (out of a possible 20) Attitude t oward t est t aking (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 a. Compute the Pearson product - moment correlation coefficient by hand and show all your work. Considering, x = total number of correct problems and y = Attitude, we have, 𝑛 = 10 , 𝑥 ̅ = 15 . 6 , 𝑦 ത = 79 . 7 , ෍ 𝑥𝑦 = 12568 , ෍ 𝑥 2 = 2476 𝑎𝑛𝑑 ෍ 𝑦 2 = 64727 Thus , Correlation coefficient = ∑ 𝑥𝑦 − 𝑛 𝑥 ̅ 𝑦 ത ඥ ( ∑ 𝑥 2 − 𝑛 𝑥 ̅ 2 ) ( ∑ 𝑦 2 − 𝑛 𝑦 2 ) = 0.5961 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? The scatter plot is given below.

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    Time to Practice – Week Five PSYCH/625 Version 1 2 Copyright © 2013 by University of Phoenix . All rights reserved. The scatter plot does not show that the data is highly correlation hence the c orrelation is indirect. 2. Rank the following correlation coefficients on strength of their relationship (list the weakest first) : +.71 +.36 – .45 .47 – .62 The required ranking is given below, 0.36 - 0.45 0.47 - 0.62 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 s tudying GPA 23 3.95 12 3.90 15 4.00 14 3.76

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