Students learn how to estimate probabilities from experimental data to check for bias. As learning progresses they consider the effect of the sample size and relative frequency.

The start of the lesson recaps writing theoretical probabilities as fractions. In the plenary, students are challenged to consider three sets of results with different sample sizes and decide which set of data is the most reliable.

##### D**ifferentiated Learning Objectives**

- All students should be able to estimate a probability from experimental data.
- Most students should be able to estimate a probability from experimental data and identify bias.
- Some students should be able to understand how sample size affects relative frequency.