Pie Chart
Barchart
Histogram
Histogram with Normal Curve
Frequency Polygon
Shapes of Distributions
- Frequency distributions: represent the number of scores that occur at certain values of a variable.
- Distributions can take on a number of shapes or forms.
Unimodal Distributions
- The mode: most frequently occurring score.
- A unimodal distribution has one mode.
Multimodal Distributions
- Multimodal distributions: more than one mode
- Bimodal distribution: two modes
Rectangular or Uniform Distributions
- Uniform distribution: all values are observed equally often
Symmetrical Distributions
- A symmetrical distribution: if cut in half, the two sides would be mirror images of one another
- Normal Distribution: a particular kind of distribution that resembles a bell (bell-shaped curve)
Skewed Distributions
- A skewed distribution is not symmetrical. It is unbalanced
Skew
Negatively Skewed Distribution
Positively Skewed Distribution
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