Hypothesis testing (normal distribution)

What you'll learn

1. 1

   Imagine you're testing whether a coin is fair. If it's fair, it should land heads half the time. If it lands heads 9 times out of 10, that's suspicious!

2. 2

   What does it mean if a coin is 'fair'?

3. 3

   Here's the normal distribution curve for a fair coin. Most results cluster around the middle — getting 5 heads out of 10. The tails show results that are very unlikely.

4. 4

   Let's test: A coin lands heads 8 times out of 10. Is it fair?

5. 5

   Drag the slider to change the number of heads out of 10. Watch the p-value change — the more extreme the result, the smaller the p-value.

6. 6

   If the p-value is 0.01, should we reject the idea that the coin is fair?

7. 7

   What does a p-value of 0.03 mean?