14. 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. The following data represent results similar to those obtained in the study. 7-Minute Screen Cognitive Series Patient 3 11 8. 19 10 22 8. 20 4 14 13 4 9. 20 14 25 a. Compute the Pearson correlation to measure the degree of relationship between the two test scores. b. Is the correlation statistically significant? Use a two-tailed test with a = .01. c. What percentage of variance for the cognitive scores is predicted from the 7-Minute Screen scores? (Compute the value of r2.) ABCDEFGH

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14. 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. The following data represent
results similar to those obtained in the study.
18.
7-Minute
Screen
Cognitive
Series
Patient
3
11
8.
19
10
22
8.
20
4.
14
13
4
9.
20
14
25
a. Compute the Pearson correlation to measure the
degree of relationship between the two test scores.
b. Is the correlation statistically significant? Use a
two-tailed test with a = .01.
c. What percentage of variance for the cognitive
scores is predicted from the 7-Minute Screen
scores? (Compute the value of r.)
15. For a two-tailed test with a = .05, use Table R 6 to
ABCD EFGH
Transcribed Image Text:14. 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. The following data represent results similar to those obtained in the study. 18. 7-Minute Screen Cognitive Series Patient 3 11 8. 19 10 22 8. 20 4. 14 13 4 9. 20 14 25 a. Compute the Pearson correlation to measure the degree of relationship between the two test scores. b. Is the correlation statistically significant? Use a two-tailed test with a = .01. c. What percentage of variance for the cognitive scores is predicted from the 7-Minute Screen scores? (Compute the value of r.) 15. For a two-tailed test with a = .05, use Table R 6 to ABCD EFGH
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