A study involves 625 college males The investigators recorde

A study involves 625 college males. The investigators recorded physiological data such as height, weight, and blood pressure. Amongst other things they calculated the regression estimate of each man\'s weight from his height. It turned out that the regression estimate was off by 20 pounds or more for 200 of the men in the study. The scatter diagram of height and weight was football shaped.

Fill in the blank with a whole number. The regression method will underestimate the weight of around ________ of the men in the study by 35 pounds or more.

I know the answer is 4% but why?

Solution