• ### Unit 4: Probability and Statistics

This unit is devoted to statistics, a branch of mathematics concerned with representation, analysis, and interpretation of data. It also involves the study of probability, which is the analysis of outcomes of random events.

Completing this unit should take you approximately 11 hours.

• ### 4.1: Data Representation

This section demonstrates different ways of representing data.
• ### 4.2: Measures of Central Tendency

Summarizing quantitative data can be done by calculating measures of central tendency (the central, or most commonly occurring, points in the data) and measures of dispersion. Measures of central tendency are discussed in this section.

• ### 4.3: Measures of Dispersion

Measures of dispersion, also referred to as measures of spread, indicate how far the data points are from the central points and one another.

• ### 4.4: Counting and Probability

The term "probability" is often used when discussing an event that might or might not happen. A real-life event probability, or chance of this event happening, usually depends on many factors and is difficult to calculate. In this section, you will learn to find probabilities of simple events, such as getting a specific number when rolling a die or getting several heads in a row when tossing a coin.

• ### 4.5: Collecting Data

Before you can represent data, you have to collect it in some way. This section discusses different ways of collecting data and how they can affect the conclusions obtained from data analysis.