# Chapter 6: Probability

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## Q1 | Relative Frequency Approach (Preview)

Length: 30 minutesAuthor: JasonComplexity: Easy The simplest questions in this chapter include frequencies of outcomes. I’ll show you how you can calculate every type of probability introduced in this chapter (joint, marginal, conditional, etc) with one simple formula – as long as you have frequencies to work with!

## Q1 | Joint + Marginal Tables

Length: 38 minutesAuthor: JasonComplexity: Easy In this video I come back to the same data as in the last question, but this time I've replaced the given frequencies with joint and marginal probabilities. This has a drastic affect on our approach to solving the exact same questions. You'll see though, that by following the wording to the proper formulas, we will come to the same answers that we originally calculated.

## Q5 | More Bayes’ Theorem

Length: 14 minutesAuthor: JasonComplexity: Standard One of the most common presentations of Bayes' law on the exam comes in the form of the false-positive and false-negative results that occur with medical testing. Understanding this one question will prepare you for all of the different components that make up Chapter 6.