# Chapter 11: Introduction to Hypothesis Testing

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## Steps of a Hypothesis Test

Length: 41 minutesAuthor: JasonComplexity: Easy The steps of a hypothesis test - for ANY hypothesis test - are always the same. This includes not only the z-test introduced in this chapter, but also all other types of hypothesis tests introduced in the chapters to come.

## When to use the z-test of One Population Mean (Preview)

Length: 3 minutesAuthor: JasonComplexity: Easy In the chapters that follow, you’ll be introduced to several different formulas for hypothesis tests. Each of these formulas is designed for a different set of conditions (number of populations being studied, type of data collected, focus of the study, etc). This video explains when to use the z-test population of μ.

## The p-Value

Length: 28 minutesAuthor: JasonComplexity: Easy There are a few reasons someone would determine the value of a p-value:

• The p-value is an alternate method for deciding whether or not to reject Ho (as opposed to using a rejection region)
• The p-value tells you the exact probability of selecting a sample as rare as the one you have - given that the Ho is true (the rejection region does not do this)
• It will get you the mark you need when asked to 'calculate the p-value' :)

## Calculating the Probability of Type II Error

Length: 18 minutesAuthor: JasonComplexity: Hard Calculating Beta (the probability of making a Type II error) is one of the most challenging problems you'll face on the final exam. In this video I'll run you through the many steps involved.

## Probability of Type II Error – Just the basic steps

Length: 13 minutesAuthor: JasonComplexity: Hard In this video I just solve the problem without all of the extra theory added in. This is exactly the set of steps you'll need to perform on your exam.

## Probability of Type II Error – Two Tailed Example

Length: 16 minutesAuthor: JasonComplexity: Hard With a two tailed (=,≠) hypothesis test there are two rejection regions. This adds an extra step to finding Beta. I'll show you here how to handle this variation of a Type II error calculation here.