**Launch JMP and create a new data table.****Enter the data.**- Rename Column 1 to "
`x`" and enter the Ammonium Phosphate data from the*x*column in Table 4.3 (p. 133). - Add a second column, "
`y`," and enter the Compressive Strength data from the table.

*Screenshot:*- Rename Column 1 to "
**Generate a fitted quadratic plot of the data.**- Select
**"Analyze --> Fit Y by X."** - In the dialog box that follows, click
**"y"**in the list labeled**"Select Columns"**; then click**"Y, Response"**to designate y as the response variable. - Click
**"x,"**then**"X, Factor"**to designate x as the factor variable. - Click
**"OK."***JMP displays a scatter plot of y vs. x.* - Click the red triangle next to the label,
**"Bivariate Fit of Density By Pressure."**Select**"Fit Polynomial --> 2,quadratic"**from the resulting pop-up menu.

*JMP fits a quadratic to the points, plots the quadratic, and displays an analysis of the fit.*- Select

**Save predicted y values for the x values given in the table.**- Beneath the plot generated in Section 1, click the red triangle next to the label,
**"Polynomial Fit Degree=2."** - Select
**"Save Predicteds"**from the pop-up menu.

*JMP saves the predicted y values to a new column in the data table.*- Beneath the plot generated in Section 1, click the red triangle next to the label,
**Save the residuals.**- Beneath the plot, click the red triangle next to the label,
**"Polynomial Fit Degree=2."** - Select
**"Save Residuals"**from the pop-up menu.

*JMP saves the y residuals to a new column in the data table.*- Beneath the plot, click the red triangle next to the label,

**Plot Residuals vs. x.**- Beneath the plot generated in Section 1, click the red triangle next to the label,
**"Polynomial Fit Degree=2."** - Select
**"Plot Residuals"**from the pop-up menu.

*JMP plots residuals vs. x and appends the plot to the current window.*- Beneath the plot generated in Section 1, click the red triangle next to the label,
**Generate a Normal Plot of the Residuals.**- Select
**"Analyze --> Distribution."** - In the dialog box that follows, click
**"Residuals y"**in the list labeled "Select Columns"; then click**"Y, Columns"**to add the residuals column to the list of columns to be analyzed. - Click
**"OK."***JMP displays the distribution of the residuals.* - Click the red triangle next to the label,
**"Residuals y."** - Select
**"Display Options --> Horizontal Layout."***JMP changes the layout of the window and the orientation of the plot.* - Click the red triangle next to the label,
**"Residuals y."** - Select
**"Normal Quantile Plot"**from the pop-up menu.

*JMP generates a normal plot and displays it in the current window.*- Select