# Unit 2: Hypothesis Testing

In Unit 1, we learned the basics of statisticsâ€”what they are, how they work, and the mathematical and conceptual principles that guide them. In Unit 2, we will learn to use everything from the previous unit to test hypotheses, formal statements of research questions that form the backbone of statistical inference and scientific progress. This unit focuses on hypothesis tests about means, and Unit 3 will continue to use hypothesis testing for other types of data, statistics, and relationships.