Identifying individuals with a high risk of Alzheimer’ disease usually involves a long series of cognitive tests. However, researchers have developed a 7-Minute Screen, which is a quick and easy way to accomplish the same goal. The question is whether the 7-Minute Screen is as effective as the complete series of tests. To address this question, Juin et al. (2008) administered both tests to a group of patients and compared the results. The following data represent results similar to those obtained in the study.
Patient | 7-Minute Screen | Cognitive Series |
A | 3 | 11 |
B | 8 | 19 |
C | 10 | 22 |
D | 8 | 20 |
E | 4 | 14 |
F | 7 | 13 |
G | 4 | 9 |
H | 5 | 20 |
I | 14 | 25 |
a. Compute the Pearson
b. Is the correlation statistically significant? Use a two-tailed test with α = .01.
c. What percentage of variance for the cognitive scores is predicted from the 7-Minute Screen scores? (Compute the value of r2.)
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Chapter 14 Solutions
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