Help me with this, I am trying to identify people at high risk for Alzheimer's disease usually involves a lengthy series of cognitive tests. However, researchers have developed a 7-Minute Screen, which is a quick and easy way to achieve the same goal. The question is whether the 7-minute screening is as effective as the full series of tests. To answer 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	cran 7-minute	Tests Cognitifs
1	5	13
2	10	21
3	12	24
4	10	22
5	6	16
6	9	15
7	6	11
8	7	22
9	16	27
10	6	15

a) Help me calculate the Pearson correlation to measure the degree of relationship between the two test results. Go step by step and in detail for the calculations.

b) Is the correlation statistically significant? Use a two-tailed test with a .01. Go step by step and in detail for the calculations.

c) What percentage of variance in cognitive scores is predicted from the 7-minute screen scores? (Calculate the value of r2.)

RStudio users: Don't forget to create a graph from the table provided in this question.