If your one-way ANOVA p-value is less than your significance level, you know that some of the group means are different, but not which pairs of groups. Use the grouping information table and tests for differences of means to determine whether the mean difference between specific pairs of groups are statistically significant and to estimate by how much they are different.

For more information on comparison methods, go to Using multiple comparisons to assess the practical and statistical significance.

Use the grouping information table to quickly determine whether the mean difference between any pair of groups is statistically significant.

Groups that do not share a letter are significantly different.

Use the confidence intervals to determine likely ranges for the differences and to determine whether the differences are practically significant. The table displays a set of confidence intervals for the difference between pairs of means. The interval plot for differences of means displays the same information.

Confidence intervals that do not contain zero indicate a mean difference that is statistically significant.

Individual confidence level

The percentage of times that a single confidence interval includes the true difference between one pair of group means, if you repeat the study multiple times.

Simultaneous confidence level

The percentage of times that a set of confidence intervals includes the true differences for all group comparisons, if you repeat the study multiple times.

Controlling the simultaneous confidence level is particularly important when you perform multiple comparisons. If you do not control the simultaneous confidence level, the chance that at least one confidence interval does not contain the true difference increases with the number of comparisons.

For more information, go to Understanding individual and simultaneous confidence levels in multiple comparisons.

For more information about how to interpret the results for Hsu's MCB, go to What is Hsu's multiple comparisons with the best (MCB)?

In these results, the table shows that group A contains Blends 1, 3, and 4, and group B contains Blends 1, 2, and 3. Blends 1 and 3 are in both groups. Differences between means that share a letter are not statistically significant. Blends 2 and 4 do not share a letter, which indicates that Blend 4 has a significantly higher mean than Blend 2.