#### Quiz 3

##### Use the following data for this quiz
Age in months Actual pounds
0 6.7
2 7.5
4 11.5
6 13.5
8.5 15.5
12 20
18 19.4
28 23
1. _______ Calculate the slope of the best fit (also known at least squares) line for the data.
2. _______ Calculate the y-intercept of the best fit line.
3. ______________ What does the y-intercept represent physically in this model?
4. ______________ Is the correlation positive, negative, or neutral?
5. _______ What is Marlin's predicted weight at 23 months?
6. _______ What is Marlin's predicted weight at 480 months?
7. _______ What is the predicted age in months at which Marlin weighed 18 pounds?
8. _______ What is the predicted age in months at which Marlin will weigh 180 pounds?
9. _______ Calculate the linear correlation coefficient r for the data.
10. ______________ Is the correlation none, low, moderate, high, or perfect?
11. _______ Calculate the coefficient of determination.
12. _______ What percent of the variation in age in months conception explains the variation weight?
13. ______________ What do you think happened to Marlin between the 12th and 18th month?