1.
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2.
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Select Analyze > Fit Y by X.
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3.
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4.
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5.
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Click OK.
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6.
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From the red triangle menu, select Compare Means > With Control, Dunnett’s.
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Alternatively, click on a row to highlight it in the scatterplot before selecting the Compare Means > With Control, Dunnett’s option. The test uses the selected row as the control group.
8.
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Click OK.
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Using the comparison circles in Figure 5.70, you can conclude that level 17 is the only level that is significantly different from the control level of 12.