Skip to content
Solved Assignments

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

Week 5 practice exercises in psychological research methods.

Preview 3 of 9 pages

See the first 3 pages exactly as they appear in the document.

  1. Page 1
    Read page 1 as text

    Time to Practice – Week Five PSYCH/625 Version 2 1 Copyright © 201 4 by University of Phoenix . All rights reserved. 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. From the given data, 𝑛 = 10 , 𝑥 ̅ = 15 . 6 , 𝑦 ത = 79 . 7 , ෍ 𝑥𝑦 = 12568 , ෍ 𝑥 2 = 2476 𝑎𝑛𝑑 ෍ 𝑦 2 = 64727 Thus, Correlation coefficient ( r ) = ∑ 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 obtained scatter plot is as follows,

  2. Page 2
  3. Page 3
    Read page 3 as text

    Time to Practice – Week Five PSYCH/625 Version 2 2 Copyright © 201 4 by University of Phoenix . All rights reserved. The scatter plot is indicating a non - linear pattern (quadratic) thus I would predict the correlation to be indirect. 2. Rank the following correlation coefficients on strength of their relationship (list the weakest first) : +.71 +.36 – .45 .47 – .62 Answer is as follows. 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

6 more pages in the full document

Unlock it once and it stays in your library, ready to chat with or turn into flashcards.

Unlock the full document

More Psychology study materials

See all

Study this document with CramX

Once it is in your library, every tool can work from it.