Laboratory quality control

What you'll learn

1. 1

   Imagine you're baking a batch of 100 biscuits. You check every 10th biscuit to make sure they're all the same size. That's quality control!

2. 2

   Here's a batch of 20 samples. The red ones are the ones we test — every 4th sample. This is called 'sampling'.

3. 3

   If you have 50 samples and test every 10th one, how many do you test?

4. 4

   Let's check a batch of 12 blood samples. We test 3 of them. What fraction is tested?

5. 5

   Tap the samples you'd test if you check every 3rd sample out of 15.

6. 6

   Why do we test only some samples instead of all of them?

7. 7

   In a real lab, if a tested sample fails (like wrong temperature), we check the whole batch. That's called 'rejecting' the batch.