A psychologist wishes to establish the reliability of a new IQ test that is
based on a variety of brain measures (including neural conduction speed and the
rate at which glucose in the brain is metabolized).
These brain measures are
factored together to provide a single scaled score for each subject. The
subjects were randomly selected from a population of young adults and given the
same brain test twice. The data are as follows:
TEST RETEST
Subject Brain Scaled Score Brain Scaled Score
1. 50 55
2. 60 57
3. 65 64
4. 40 45
5. 35 40
6. 40 38
7. 60 57
8. 55 54
9. 50 48
10. 45 45
11. 52 50
12. 48 50
13. 51 52
14. 49 50
15. 50 50
16. 50 49
17. 37 40
18. 63 60
19. 50 50
20. 50 50
What is the reliability of this new test.
What will be an ideal response?
Question 2
When graphing the distribution of differences, the ordinate is used to
represent
a. a sample mean
b. the difference between the mean of the individual raw scores and the sample
mean
c. the difference between two sample means
d. frequency of occurrence
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