A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of sit-ups a person can do (y). The results of the Excel regression analysis were:

y=33.2891.349x

R2=0.5329

a) What percent of the variation in number of sit-ups cannot be explained by hours of watching TV, but is due to the other factors?

(b) Calculate the coefficient of correlation r= ?

(c) Assume the correlation is strong, and use this information to predict the number of sit-ups a person who watches 14 hours of TV can do?