# Lesson 2: Simple Comparative Experiments

### Lesson 2: Introduction

This chapter should be a review for most students who have the required prerequisites. We included it to focus the course and confirm the basics of understanding the assumptions and underpinnings of estimation and hypothesis testing.

### Learning objectives & outcomes

Goals for this lesson include the following:

- to review basic statistical concepts
- to review sample size calculation for two sample problems based on the
*t*-test - to review the difference between two independent samples and paired comparison design
- to review the assumptions underlying the
*t*-test and how to test for these assumptions