Review Quiz 1

Source: https://www.bloglovin.com/blogs/drawing-on-math-6712237/grades-2067306239

Source: https://sketchplanations.com/sneaky-averages

Key assumptions of linear regression models in practice
Understanding the Normal model with pictures - let’s go over problems 10-15 together on the board…

Main Ideas

Examine part (sample) of the whole (population)
Randomize to avoid bias
Sample size need not be relative to population size

1. Populations and Their Parameters

Q: What is the difference between variance and variability/variation?

2. The elusive Simple Random Sample (SRS)

Important: Random \(\neq\) Arbitrary

3. Practical Sampling Designs

Goal: Representative and (somehow) random sample

Stratified random sampling
Cluster and multistage sampling
Systematic sampling