Biomedical Engineering Reference
In-Depth Information
The standard deviation is useful in defining the distribution of data in terms of z-scores, which are
measures that represent the deviation of a specific observation from the mean divided by the
standard deviation. Given a standard deviation (
s
) of 3.54, the mean intensity levels of the three
samples are all within about one standard deviation of the mean—much better than the typical
criterion for inclusion of within the typical four z-scores (four standard deviations from the mean), as
illustrated in
Figure 6-19
.
Figure 6-19. Z-Scores of Mean Intensity Values. All values are within one z-
score (one standard deviation from the mean).
