# Fitting a Line in MINITABTM

## Chapter 4, Printout 1

### Section 1: Making a Fitted Line Plot

1. Launch MINITAB.

2. Enter the data.

• Name Column C1 by clicking the blank column label and typing "Pressure"

• Name Column C2 "Density"

• In Column C1, enter the pressure data from the "x" column in Table 4.1 (p. 124).

• In Column C2, enter the density data from the "y" column of Table 4.1.

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3. Generate the fitted line plot.

• Select "Stat --> Regression --> Fitted Line Plot."

• Fill out the resulting dialog box as follows:

Input Type Label Value
Response (Y): Density
Predictor (X): Pressure
Linear selected

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• Click "OK."

MINITAB displays a fitted line plot of Density vs. Pressure.

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### Section 2: Obtaining the Fitted Equation and Additional Numerical Summaries

1. Display summary information for the fitted line.

• Select "Stat --> Regression --> Regression."

• Fill out the resulting dialog box as follows:

Input Type Label Value
Response: Density
Predictors: Pressure

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• Before closing the dialog box, click "Results."

• In the dialog box that follows, click the radio button next to the label, "In addition, the full table of fits and residuals."

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• Click "OK" to close the "Results" dialog box.

• Click "OK" in the "Regression" dialog box.

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

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### Section 3: Generating Additional Plots

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

• Select "Stat --> Regression --> Regression."

• Fill out the resulting dialog box as described in Section 2.

• Before closing the dialog box, click "Graphs."

• Fill out the resulting dialog box as follows:

Input Type Label Value
Regular selected
Histogram of residuals unchecked
Normal plot of residuals checked
Residuals versus fits checked
Residuals versus order unchecked
Residuals versus the variables: Pressure

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• Click "OK" to close the "Graphs" dialog box.

• Click "OK" in the "Regression" dialog box.

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

Screenshot (normal plot of residuals):

Screenshot (residuals vs. fits):

Screenshot (residuals vs. pressure):