3. [6.5 points] Refer to the dataset "cyclosporine.xlsx" used in problem 1. 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). 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) 3a. [3 points] Calculate the correlation coefficient between creatinine levels and systolic blood pressure. Describe the strength of the association. 3a. ANSWER: 3b. [1 point] What percent of the variation in creatinine levels is explained by systolic blood pressure? 3b. ANSWER: 3c. [2.5 points] Use a regression model to predict the creatinine level of an individual who has a systolic blood pressure of 120 mmHg. Include all Stata code and output. Include the linear regression equation that you used. [ You do not need to check assumptions, include a graph, conduct a hypothesis test, or interpret anything.] 3c. ANSWER: