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	7
B	7	15
C	4	14
D	5	13
E	7	9
F	5	15
G	11	25

Compute the Pearson Correlation Coefficient for these data.

r =

The correlation is:
A. medium and negative

B. Large and negative

C. Large and positive

D. Medium and positive

What is the alternate hypothesis in words?

Answer 1

The detailed solution is given in the pictures below.

Please go through them carefully specially the notations.

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