1. Unit 7. Day 4.

2. We want information on a large population.
We don’t/can’t check everything/everybody
Q: What do we do?
A: We take a
sample of the population
REPRESENTATIVE
Random selection
from the larger population
Using a goldilocks amount
Q: Why is it important that the selection is random?
A: “Random sampling tends to produce representative samples and support valid inferences”

3. Ballot Activity Step 1: Who wins (each election) in your tiny sample?
Step 2: Who wins (each election) in your medium sample?
Step 3: Who wins (each election) in your large (class) sample?
Step 4: Who wins (each election) in the population?