A doctor collects data on all the men in his practice. Their daily potassium intake is 4500 mg/day, with a standard deviation of 1000 mg/day. They have an average systolic blood pressure of 150 mmHg,...

Extracted text: A doctor collects data on all the men in his practice. Their daily potassium intake is 4500 mg/day, with a standard deviation of 1000 mg/day. They have an average systolic blood pressure of 150 mmHg, with a standard deviation of 10 mmHg. The two variables have correlation r = 3. -0.4. (a) One of the men is at the 25 percentile of potassium intake and 75 percentile of blood pressure. Relative to all other men at the 25th percentile potassium intake, this man's blood pressure is (circle one) smaller than average about average larger than average Justify your answer using a written explanation and/or a diagram.


Extracted text: (b) A man is selected at random from the practice. His potassium intake is 5500 mg/day, which means that he is SD(s) above the average potassium intake of men in the practice. Another way of expressing his relative potassium intake is that he is at the percentile of intake among all men in the practice. (c) Using regression, we can predict the man from part (b) will have a blood pressure that is SD(s) (choose between above/below) average. Therefore, he is predicted to be at the percentile of blood pressure.