## MATH 399N Week 2 Homework Solutions: → Spring 2017

Week 2 Homework 40pts

Q. Two variable have a positive linear correlation. Does the independent variable increase or decrease as the independent variable increase?

Q. Difference between r and p

Q. a golfer wants to determine if the number of lessons received every year can be used to predict the amount of improvement in his game

Q. Two variable have a positive linear correlation. Is the slope of the regression line for the variables positive or negative?

Q. y-intercept

Q. the mean of the y-values

Q. calculate the coefficient of determination

Q. What does this tell you about the explained variation of the data about the regression line? (The coefficient of determination, r2, is the ratio of the explained variation to the total variation. Convert this to a percentage by multiplying by 100.)

Q. What about the unexplained variation? (Find the remaining percentage)