## Key concepts and where to find them in the book

- Levels of measurement: nominal, ordinal and interval p. 140

- Inferential statistics p. 8
- Difference between a sample and a population. top of p.9
- Standard deviation - a measure of variation. bottom of p. 68
- Frequency distribution pp.83-84
- Histogram - simply a chart of the frequency distribution pp.85-91
- Skewness the lack of symmetry in a distribution p. 96
- Correlation pp.113-116, 128-129 Correlation matrix pp.124-126

- Scatterplot pp. 120-124
- Standardized scores (AKA z-scores) pp. 182-183, 186
- Introduction to linear regression pp.292-304
- Chi-square test pp.312-313

## Information about types of variables (AKA level of measurement)