# Stratified sampling

In this lesson, we will learn to understand and interpret stratified sampling and calculate sample sizes of strata

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which type of sampling requires a certain amount of responses from a particular section of the population?

1/3

Q2.Which type of sampling divides the data into sub-groups so a representative sample of each group is taken?

2/3

Q3.What type of sampling is most appropriate for testing the quality of products on a production line?

3/3

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which type of sampling requires a certain amount of responses from a particular section of the population?

1/3

Q2.Which type of sampling divides the data into sub-groups so a representative sample of each group is taken?

2/3

Q3.What type of sampling is most appropriate for testing the quality of products on a production line?

3/3

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Stratified sampling

Understand stratified sampling and calculate sample sizes of strata.

Q1.If the whole sample size is 50, what is the sample size of the bus users?

1/3

Q2.If the whole sample size is 25, what is the sample size of the car users?

2/3

Q3.If the whole sample size is 75, what is the sample size of the walkers?

3/3

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Stratified sampling

Understand stratified sampling and calculate sample sizes of strata.

Q1.If the whole sample size is 50, what is the sample size of the bus users?

1/3

Q2.If the whole sample size is 25, what is the sample size of the car users?

2/3

Q3.If the whole sample size is 75, what is the sample size of the walkers?

3/3

# Lesson summary: Stratified sampling

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Jog

On the spot:
Dance