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# 2.1 Treat LIKE as an ordinal variable and examine its relation to GPA. A. B. C. Which measure of association would you choose and why?

2.1 Treat LIKE as an ordinal variable and examine its relation to GPA.
A. B.
C.
Which measure of association would you choose and why? Calculate that correlation coefficient for n=18 (the first 18 cases). Also calculate the measure of significance. Show all steps in your work. Interpret the results and be specific.
© Park University SO307 - Page 1 2/18/2008
D. Draw up a scattergram (scatterplot) for this correlation and discuss how it helps you interpret the results. Are there particular cases that throw off the patterns of the results? Explain and justify.
CASE #
GNDR TRAK
STDY GPA
5.5 0.55
5.8 0.63 3.3 0.67
4.7 0.71 4.2 0.72
6.7 0.76 3.8 0.75
3.5 0.79 5.7 0.79
5.3 0.83 6.3 0.88
HIGH SCHOOL SENIORS
GNDR = Gender
F= 1 M= 0
TRAK = Course of Study
1 = remedial 2 = vocational 3 = mainstream 4 = college prep
ranked index of
1 1 1 19 2
2 1 1 17 4
3 0 1
16 8
4 0 1 17 6
5 1 2
14 6
6 1 1 15 8
7 1 3
11 7
8 0 2 20 7
9 1 2
12 6
10 0 1 12 7
11 1 2
7 7
12 0 2 7 8
5.1 0.91 resources
13 0 3
14 1 3 15 1 3
16 0 2 17 0 3
18 0 3
19 1 1
20 1 4 21 0 4
22 0 4
7 4
6 5 4 4
4 5 7 5
3 10
21 3
21 8
2 10
1 10
4.4 0.90
5.6 0.92 6.1 0.95
5.7 0.94 5.1 0.96
6.2 0.98
2.9 0.50
4.5 0.50
4.1 0.99
2.2 1.00
for education
LIKE = Attitude Toward Teachers
1 = does not like teachers 10 = likes teachers a lot
STDY = Study time
hours per week
as percentage
2.2 Examine the association between STDY and GPA. A. Which measure of association would you choose and why? B. Calculate that correlation coefficient for n=20 (the first 20 cases). Also calculate the measure of
significance. Show all steps in your work. C. Draw up a scattergram (scatterplot) for this correlation (overlay the slope of the correlation) and
discuss how it helps you interpret the results. Are there particular cases that throw off the
patterns of the results? Explain and justify. D. Calculate that correlation coefficient for n=22 (all cases). Also calculate the measure of
significance. Show all steps in your work. E. Draw up a scattergram (scatterplot) for this correlation (overlay the slope of the correlation) and
discuss how it helps you interpret the results. Are there particular cases that throw off the
patterns of the results? Explain and justify. C. Interpret the results from B-E and be specific. Discuss how the results change when the
2.3 Now, suppose you wish to assert a stronger, causal relation between STDY and GPA. A. Which measure of association would you choose and why? B. Which variable would you choose to be the independent? Why? C. Calculate the appropriate statistics for this analysis if n=20. Show all steps in your work. D. Draw up a scattergram (scatterplot) for these data (overlay the regression line) and discuss
how it helps you interpret the results. Are there particular cases that throw off the patterns of the results? Explain and justify.
© Park University SO307 - Page 2 2/18/2008
E. Interpret the results from C and D and be specific. F. Compare the results from 2.3.E and 2.2.B. How does the choice of a correlational, vs. a
Part 3: SPSS
Complete the SPSS demonstrations in Part 3. Clearly label your work in your SPSS output file and in your assignment. Include all of your problems in one SPSS output file. Multiple files will not be accepted.
3.1 Complete SPSS Demonstration 14.3 (p. 390-91) for yourself and submit the resulting SPSS Output (.spo) file along with your assignment. Clearly label this exercise in your output file and note that you did it in your assignment submission.
3.2 Complete SPSS Demonstration 15.1 (p. 421-3) for yourself and submit the resulting SPSS Output (.spo) file along with your assignment. Clearly label this exercise in your output file and note that you did it in your assignment submission.
Submitting the Assignment and Due Date
Submit your assignment to the Dropbox by Sunday midnight CST of Week 7. Format
General Format
o Please include a cover page with your name on it. o Format the paper using a 12 point font and double spaced. o The format and appearance should be professional and will be included as a portion of your
grade. Use any report format you desire, all I ask is that the document looks and reads at a professional and/or college level of work.
This assignment is worth 60 points.
Questions and Issues:
If you have any questions or issues, please post them to the Q & A discussion thread.

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