An analysis is performed to investigate the relationship between cardiovascular exercise and percent body fat. The summary statistics for 20 men and 30 women are:

Variable	Men	Women
	Mean	SD	Mean	SD
# hrs cardio exercise	4.7	2.2	2.5	1.4
% body fat	20.1	3.1	31.6	8.1

Answer the following questions [Hint: for men and for women]

a)Estimate the regression equations relating the number of hrs of exercise to percent body fat for men and women (separately).

b)What is the expected percent body fat for a male who exercised 2 hrs per week?

c)What is the expected percent body fat for a woman who does not exercise?

d)Calculate the correlation between the 2 variables for men and explain your result.

e)How much variation in the dependent variable is left unexplained by the model for men? (none, a small amount or a large amount?)

f)What is the proportion of observed variation in men? Is this an impressive result?