# Correlation analysis in SPSS

For 1, 2, and 3

a) explain which test is appropriate and why

b) interpret the results in classical hypothesis testing language

c) and explain what the confidence interval means.

1. A drug-addled gas-bag, rightwing radio talk show host (who believes he understands testing) says that anybody can score at least 25 points on the non-standardized writing test used at liberal Cosmopolitan University. A randomly selected group of 10 people who listen to talk radio are selected and tested. Their scores are as follows:

22, 25, 20, 24, 21, 16, 25, 14, 30, 19

Is the radio talk show host correct? Use your SPSS skills to answer the question.

2. 12 students are tested for writing ability both before and after a special writing seminar. The scores on this non-standardized test are as follows:

Student: 1 2 3 4 5 6 7 8 9 10 11 12

Before: 20, 18, 25, 18, 16, 21, 25, 24, 28, 16, 17, 16

After: 23, 20, 30, 17, 17, 25, 29, 24, 29, 20, 23, 26

OK, you have some data. What next? You should realize that you have the skills

to analyze them. What test would be appropriate? Run the test and make conclusions.

3. One group of 15 students takes the special writing seminar while another group of 15 students does not. They are then tested for writing ability on a non-standardized test, and the scores are as follows:

Seminar: 26, 23, 20, 29, 24, 29, 25, 17, 17, 30, 20, 23

No Seminar: 16, 17, 16, 28, 24, 25, 21, 16, 18, 25, 18, 20

Once again, you have some tools at your disposal. Don't just sit there!

4. Calculate the appropriate effect size statistics for 2 and 3 above. Consult the Penguin.

5. Estimate the Power for 2 and 3 above. Your text provides the appropriate tables. Find them!!

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#### Solution Summary

The solution provides step by step method for the correlation analysis in SPSS 17 . Formula for the calculation and Interpretations of the results are also included.