Chapter 13

Testing Hypotheses

IN THIS CHAPTER

Bullet Understanding the basic parts of a hypothesis test

Bullet Setting up your null and alternative hypotheses

Bullet Calculating test statistics

Bullet Determining the critical values

Bullet Drawing conclusions and making interpretations

A hypothesis test is a statistical procedure designed to test a claim about a population. In other words, someone proposes a certain parameter, and you want to test the claim by using data. Testing a hypothesis is different from a confidence interval situation, where you have no idea what the parameter is and you use your data to estimate it.

In this chapter, you review the basic ideas and steps of conducting a hypothesis test, and you practice setting up and carrying out the most common hypothesis tests: the tests for a population mean, a population proportion, two population means, and two population proportions. You also practice working with the t-distribution, which you use in situations where the sample sizes are too small to ...

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