Author Question: A regression analysis of hours spent exercising and ounces of weight loss had a slope of 3. We would ... (Read 110 times)

CORALGRILL2014 · **on:** Jun 20, 2018

A regression analysis of hours spent exercising and ounces of weight loss had a slope of 3. We would predict that

a. for every 1 hour of exercise, a person would lose 3 ounces of weight.
b. for every ounce lost, a person has to exercise for 7 hours.
c. every hour of exercise would have no effect on weight.
d. The slope cannot be used to make predictions, you need the intercept.

Question 2

An example in the text hypothesized that 4 of the variability in life expectancy was accounted for by variability in smoking behavior. The values of r and r2, respectively, are equal to

a. .20 and .04.
b. .04 and .16.
c. .04 and .20.
d. More information is needed.