of Frequency Distributions
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- Symmetric Distributions
- In a symmetric distribution it is possible to draw a
vertical line through the middle so that one side of the
distribution is an exact mirror image of the other.
- Skewed Distributions
- In a skewed distribution the scores tend to pile up
toward one end of the scale and taper offer gradually
at the other end.
The section where the scores taper off toward one
end of a skewed distribution is called the tail
of the distribution.
A skewed distribution with the tail on the right-hand
side is called positively skewed because the
tail points toward the positive (above-zero) end of
the X-axis. If the tail points towards the left, the
distribution is called negatively skewed.
- Here is a Positively Skewed distribution: