You need to find the best predictor for abalone's age. This is a trail and error process. What you need to do:
a. Create a new worksheet called "Single variable regression for Rings"
b. Explore different variables for regression models of "Rings". You could choose to use stacked data or unstacked data.
c. Examine each models mean squared error. The smaller the errors are the better the prediction model you have.
d. Decide the best regression model(s). Explicate your regression equations. Explain the efficients in ons in v models Report of the best model