1. descriptive statistics

1.1 graphical techniques

1.2 numerical techniques, such as average or mean

2. inferential statistics

3. key statistical concepts

3.1 population

3.2 parameter, a descriptive measure of a population

3.3 sample

3.4 statistic, a descriptive measure of a sample

4. statistical inference

4.1 the confidence level

4.2 the significance level