Hypothesis testing (one sample)

What you'll learn

1. 1

   Imagine you have a bag of 100 sweets. Your friend says 40% are red. You pick 10 and only 2 are red. Is your friend right? That's hypothesis testing!

2. 2

   What's the first thing we do in hypothesis testing?

3. 3

   Let's test if a coin is fair (50% heads). You flip it 20 times and get 15 heads. Is that weird?

4. 4

   Use the number line to see where 15 heads out of 20 falls. Is it in the 'weird' zone?

5. 5

   In our coin example, the p-value was about 0.02. What does that mean?

6. 6

   Now you test: a company says their new battery lasts 10 hours on average. You test 8 batteries and get a mean of 9.2 hours. Drag the sample mean onto the scale. Is it far from 10?

7. 7

   If the p-value is 0.08 (8%) and we use a 5% significance level, what do we do?