Question
3. Refer to the Lincolnville School District bus data. Consider a regression a) In addition to the engine dummy variable construct manufacturer dummy variables. (Hint:
3. Refer to the Lincolnville School District bus data. Consider a regression
a) In addition to the engine dummy variable construct manufacturer dummy variables. (Hint: Since there are 3 manufacturers, you need 2 dummy variables. One takes a value of 1 if the manufacturer is Keiser and 0 if the
manufacturer is Thompson or Bluebird and a second takes a value of 1 if the manufacturer is Thompson and 0 if the manufacturer is Keiser or Bluebird. Note: Having 3 dummies for 3 manufacturers would create multicollinearity.) b) Suppose you are considering a regression where maintenance cost is the dependent variable and the potential independent variables are manufacturer (both dummy variables, engine type, age, odometer miles, and capacity.) Create a correlation matrix. Are there any |
variables you think cannot be in a regression together? c) Use a statistical software package to determine the multiple regression equation. (Use your conclusions from the correlation matrix to omit independent variables, if necessary.)
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