Fitting a Quadratic in MINITABTM

Chapter 4, Printout 2


Section 1: Making a Fitted Quadratic Plot

  1. Launch MINITAB.

  2. Enter the data.

    Screenshot: screenshot

  3. Generate the fitted quadratic plot.

    MINITAB displays a fitted quadratic plot of y vs. x.

    Screenshot: screenshot


Section 2: Obtaining the Fitted Equation and Additional Numerical Summaries

  1. Add an x2 column.

  2. Compute a quadratic fit and display summary information.

    MINITAB displays summary information, including the regression equation and a table of fits and residuals.

    Screenshot: screenshot


Section 3: Generating Additional Plots

  1. Display a normal plot of residuals, residuals vs. fits, and residuals vs. x.

    MINITAB displays a normal plot of residuals, a plot of residuals vs. fits, and a plot of residuals vs. x.

    Screenshot (normal plot of residuals): screenshot

    Screenshot (residuals vs. fits): screenshot