Question

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) Compute the Pearson Correlation Coefficient for these data.

r =

b)The correlation is:

c)The null hypothesis for a two-tailed test is:

d)The alternative hypothesis in symbols for a two-tailed test is

e)If we use a two-tailed test with α = .01, the critical r values are:

f)Your decision is:

Answer 1