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. 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/b. Compute the Pearson correlation to measure the degree of relationship between the two test scores. Is the correlation statistically significant? Use a two-tailed test with α = .01. For this problem, complete the four stages of hypothesis testing by hand: Identify the two hypotheses Determine the critical region for your decision Compute the test statistic Use the test statistic to make a decision and interpret that decision c. What percentage of variance for the cognitive scores is predicted from the 7-Minute Screen scores?(by hand) (Compute the value of r2.) Also, interpret the value of r2.

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Description: 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 wheth

MATLAB: An Introduction with Applications

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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. 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/b. Compute the Pearson correlation to measure the degree of relationship between the two test scores. Is the correlation statistically significant? Use a two-tailed test with α = .01. For this problem, complete the four stages of hypothesis testing by hand:

Identify the two hypotheses

Determine the critical region for your decision

Compute the test statistic

Use the test statistic to make a decision and interpret that decision

c. What percentage of variance for the cognitive scores is predicted from the 7-Minute Screen scores?(by hand) (Compute the value of r2.) Also, interpret the value of r2.

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