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

1. Compute the Pearson Correlation Coefficient for these data.

r =

1b.

The correlation is

Group of answer choices

a. Medium and negative

b. Large and negative

c. Large and positive

d. Medium and positive

1a.

The alternative hypothesis in words for a two-tailed test is

Group of answer choices

a. The correlation between the scores on the 7-minute screen test and the scores on the cognitive series is significant

b. The correlation between the scores on the 7-minute screen test and the scores on the cognitive series is not significant

c. The correlation between the scores on the 7-minute screen test and the scores on the cognitive series is less than zero

d. The correlation between the scores on the 7-minute screen test and the scores on the cognitive series is greater than zero

1b.

The null hypothesis in symbols for a two-tailed test is

Group of answer choices

a. H1: ρ = 0

b. H1: ρ ≠ 0

c. H1: r = 0

d. H1: r ≠ 0

1c

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

Group of answer choices

a. ±0.833

b. ±0.874

c. ±0.754

d. ±0.669

1d.

Your decision is:

Group of answer choices

a. Reject the null hypothesis and conclude that there is a significant correlation between the scores on the 7-minute screen test and the scores on the cognitive series

b. Fail to reject the null hypothesis and conclude that there is a significant correlation between the scores on the 7-minute screen test and the scores on the cognitive series

c. Reject the null hypothesis and conclude that there is no significant correlation between the scores on the 7-minute screen test and the scores on the cognitive series

d. Fail to reject the null hypothesis and conclude that there is no significant correlation between the scores on the 7-minute screen test and the scores on the cognitive series

1e.

Report the results in APA

Answer 1