# TES Maths: Inspect the spec - sampling

Explore the changes to teaching sampling as part of the new GCSE specification with resources and guidance from TES Maths

## Tips and resources to ensure you've grasped the requirements for teaching sampling as part of the new specification

Everyone is talking about functions and frequency trees, but what else has changed with the advent of the new specification? And what resources are available to help? Throughout this series, TES Maths aims to find out.

### What does the specification say?

The expectation is that:

• All students will develop confidence and competence with the content identified by standard type
• All students will be assessed on the content identified by the standard and the underlined type; more highly attaining students will develop confidence and competence with all of this content
• Only the more highly attaining students will be assessed on the content identified by bold type. The highest attaining students will develop confidence and competence with the bold content.

S1: Infer properties of populations or distributions from a sample, whilst knowing the limitations of sampling

### What's the same?

This topic has caused a lot of confusion! While both AQA and Edexcel have not explicitly mentioned stratified sampling in their new specifications, both sampling and proportional reasoning still feature. So, what does this mean?

Well, as long as a question does not use the word “stratified” without defining its meaning, it would be reasonable for exams to include a question on stratified sampling. It is just another form of proportion after all.

As such, I will definitely be teaching the method of stratified sampling to my higher students. Just to be on the safe side...

### What has changed?

This depends on which awarding body you are following.

All awarding bodies are likely to place a greater emphasis on discussing the merits of sampling, considering questions such as: What makes a biased sample? What makes a representative sample? What is a reasonable sample size in a given situation? In addition, students will need to know that the statistics they calculate from samples (eg, the mean) can be used to make predictions about the population itself.

If you are following Edexcel, then you are in for a real treat. For the first time, they've introduced the Lincoln-Petersen capture-recapture method. If you're anything like me, you may remember being taught this at school as part of a science lesson. Thankfully, it's not too taxing. And the resources below ought to help.

### How can TES Maths can help?

As ever, the wonderfully talented authors of the TES Maths community have stepped up to the mark to lend a hand. Here is a selection of my favourite resources to help support the teaching of this topic:

1. Introduction to sampling
Jam-packed with engaging tasks, this differentiated lesson from TES Author Pixi_17 is ideal for acquainting students with different sampling types.
2. Sampling techniques match-up
Use this simple activity to start a discussion about the merits of various sampling techniques relative to given situations.
3. Full stratified sampling lesson
If you're still planning on teaching stratified sampling, this detailed lesson includes increasingly difficult examples to get students thinking.
4. Capture-recapture introduction
This biology lesson offers a clear introduction to the capture-recapture method of sampling. Don't worry about the section on quadrants, although it could be a useful visual tool.
5. Simple capture-recapture lesson
Present the concept in a mathematical setting with this full lesson, including worked examples and a codebreaker activity. Discover ways to use this resource in your classroom here.
6. Formula information sheet
Ideal as a reference point for students, this single page of instructions neatly explains the different parts of the formula.
7. Marking and recapturing snails
For something a bit more hands-on, why not go outdoors and study snails? It's a great way of consolidating work on the capture-recapture method.