**Quantitative data:** Numerical observations.

**Qualitative data:** Non-numerical observations.

**Continuous Variable:** Can take any value in a given range.

**Discrete Data:** Can only take specific values in a given range.

**Oulier:** An extreme value that lies outside the overall pattern of data. This is any value that is:

- Greater than upper quartile + (1.5 X IQR)
- Less than lower quartile - (1.5 X IQR)

**Quartiles:**

- Q2-Q1 = Q3 -Q2 then the distribution is symmetrical.
- Q2-Q1 < Q3-Q2 then the distribution is positively skewed.
- Q2-Q1 > Q3-Q2 then the distribution is negatively skewed.

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