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

ADV LIKE

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

ADV = Home Advantage

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

GPA = Average Grades

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

additional cases are included in your results.

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

regression, analysis change your interpretation?

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.

Grading Criteria

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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