Sampling methods

What you'll learn

1. 1

   Imagine you want to know what everyone in your school thinks about school dinners. You can't ask 1000 people — so you pick a smaller group called a sample.

2. 2

   Why do we use a sample instead of asking everyone?

3. 3

   Let's say you want to know the most popular sport in your year group (200 students). You pick 30 names from a hat — every name has the same chance. That's a simple random sample.

4. 4

   You have 8 students. Pick 3 names at random — each person has the same chance.

5. 5

   Sometimes picking randomly is hard. Instead, you might pick every 10th person on a list — that's called systematic sampling.

6. 6

   Which method gives EVERYONE an equal chance of being chosen?

7. 7

   You survey 50 students about their favourite lunch. What is this group of 50 called?