A survey of families was done to search for variables that could predict drowning. One particular variable proved useful: ice cream consumption! When people eat more ice cream, their risk of drowning is higher. (This is not a causal relationship.)
Ice cream consumption (x) is measured in ounces bought per household per week, and drowning (y) is measured in number of persons per million who die by such means each week.
The correlation (r) between these two variables is 0.67. The variances of x and y, respectively, are 14.57 and 8.16. The means of x and y are 20.00 and 9.31.
What is the intercept of the regression line the researchers used?