**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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