This dataset presents data from 17 participants, 7 of whom were given cyclosporine, an immunosuppressant, as part of an organ transplant, and 10 of whom were given a different drug. Researchers were also interested if higher systolic blood pressure (mmHg) is correlated to higher creatinine levels (mg/dL).

Participant	Cyclosprine	creatinine	systolic
1	1	0.84	124
2	1	0.86	124
3	1	0.8	121
4	1	0.7	117
5	1	0.8	119
6	1	0.76	120
7	1	0.81	123
8	0	1.2	133
9	0	1.2	131
10	0	0.91	127
11	0	0.94	127
12	0	1.14	129
13	0	0.9	128
14	0	1.1	130
15	0	0.88	125
16	0	0.91	125
17	0	0.92	126

Variables in this data include:

IDnum: Participant ID (1 to 17)

cyclosporine: Indicator of cyclosporine use (0 for other drug, 1 for cyclosporine)

creatinine: Participant serum creatinine level (mg/dL)

systolic: Participant systolic blood pressure level (mmHg)

1. Calculate the correlation coefficient between creatinine levels and systolic blood pressure.

Describe the strength of the association.

2. What percent of the variation in creatinine levels is explained by systolic blood pressure?

3. Use a regression model to predict the creatinine level of an individual who has a systolic blood pressure of 120 mmHg.