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Identifying individuals with a high risk of Alzheimer’s 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, Ijuin et al. (2008) administered both tests to a group of patients and compared the results.
|
Patient |
7-Minute Screen |
Cognitive Series |
|
A |
3 |
7 |
|
B |
7 |
15 |
|
C |
4 |
14 |
|
D |
5 |
13 |
|
E |
7 |
9 |
|
F |
5 |
15 |
|
G |
11 |
25 |
Compute the Pearson
r =
Do not round
The sums are,
| 7-Minute screen(x) | Cognitive Series (y) | x | xy | |
| 3 | 7 | 9 | 49 | 21 |
| 7 | 15 | 49 | 225 | 105 |
| 4 | 14 | 16 | 196 | 56 |
| 5 | 13 | 25 | 169 | 65 |
| 7 | 9 | 49 | 81 | 63 |
| 5 | 15 | 25 | 225 | 75 |
| 11 | 25 | 121 | 625 | 275 |
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