Biostatistics for the Clinician## Biostatistics for the Clinician

## University of Texas-Houston

Health Science Center## Lesson 2.2

## Hypothesis Testing

Lesson 2: Inferential Statistics 2.2 - 1

Biostatistics for the Clinician## 2.2 Hypothesis Testing

## 2.2.1 Formulation of Hypotheses

Inferential statistics is all about hypothesis testing. The research hypothesis will typically be that there is a relationship between the independent and dependent variable, or that treatment has an effect which generalizes to the population. On the other hand, the null hypothesis, upon which the probabilities are based, will typically be that there is no relationship between the independent and dependent variable, or that the treatment has no real effect. In other words, apparent differences in the samples are flukes. To examine these hypotheses many different kinds of statistical tests are used. These tests are chosen based on the kinds of variables being examined and the kinds of samples.