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Select Analyze > Fit Y by X.
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Click OK.
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From the red triangle menu, select each one of the Compare Means options.
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Although the four methods all test differences between group means, different results can occur. Comparison Circles for Four Multiple Comparison Tests shows the comparison circles for all four tests, with the age 17 group as the control group.
From Comparison Circles for Four Multiple Comparison Tests, notice that for the Student’s t and Hsu methods, age group 15 (the third circle from the top) is significantly different from the control group and appears gray. But, for the Tukey and Dunnett method, age group 15 is not significantly different, and appears red.