See more related video:Analysis of Variance (ANOVA)
The one-way ANOVA procedure performs an analysis-of-variance to test whether or not the means of two or more samples are equal. In one-way ANOVA, there is only one treatment factor variable. It assumes all the samples are drawn from normally distributed populations with equal variance. One-way ANOVA is an extension of the two-sample t-test, which yields the same result when the factor variable has only two levels.
In addition to determining that differences exist among the means, the one-way ANOVA procedure provides multiple means comparisons in order to identify which particular means are different; it tests for equal variance among the samples; and it performs a power analysis, computing the actual power and the hypothetical power for the analysis.
The ANOVAOneWay Dialog Box
To perform a One-Way ANOVA: