713 / 762
Chapter 16: One-Way Analysis of Variance
713
Figure
16-3:
Confidence interval display for the different
classifications
Based on the above observations, it is unlikely that the differences in the
sample averages for the number of credit hours for the different
classifications are due to sample variations. That is, we may say that the
variability between the sample averages in the different classifications is
large when compared to the variability within the samples for all the
classifications combined.
In addition, one may safely say that there are no significant differences
between the averages for the populations of the number of credit hours for
the freshman, sophomore, and senior classifications. This observation may
be further reinforced by observing that both the box plots and the confidence
intervals overlap for these variables.