Book Image

CompTIA Data+: DAO-001 Certification Guide

By : Cameron Dodd
Book Image

CompTIA Data+: DAO-001 Certification Guide

By: Cameron Dodd

Overview of this book

The CompTIA Data+ certification exam not only helps validate a skill set required to enter one of the fastest-growing fields in the world, but also is starting to standardize the language and concepts within the field. However, there’s a lot of conflicting information and a lack of existing resources about the topics covered in this exam, and even professionals working in data analytics may need a study guide to help them pass on their first attempt. The CompTIA Data + (DAO-001) Certification Guide will give you a solid understanding of how to prepare, analyze, and report data for better insights. You’ll get an introduction to Data+ certification exam format to begin with, and then quickly dive into preparing data. You'll learn about collecting, cleaning, and processing data along with data wrangling and manipulation. As you progress, you’ll cover data analysis topics such as types of analysis, common techniques, hypothesis techniques, and statistical analysis, before tackling data reporting, common visualizations, and data governance. All the knowledge you've gained throughout the book will be tested with the mock tests that appear in the final chapters. By the end of this book, you’ll be ready to pass the Data+ exam with confidence and take the next step in your career.
Table of Contents (24 chapters)
Part 1: Preparing Data
Part 2: Analyzing Data
Part 3: Reporting Data
Part 4: Mock Exams

Comprehending bar charts

One of the most iconic charts is the bar chart. Everyone has seen one and they are sometimes taken to symbolize the general concept of a chart. What you may not know is that there are actually several different kinds of bar charts that are used for different situations. Here are a few of the most common ones.

Bar charts

The classic bar chart is the simplest form of bar chart, but also one of the most useful. Bar charts are used to compare one quantitative variable to a qualitative variable. In other words, you are looking at a number that is broken down into categories. We can see what this looks like in Figure 13.3:

Figure 13.3 – Bar chart

Figure 13.3 – Bar chart

Each bar represents a group, and the size of the bar represents the number value for that group. This is the bread and butter of data visualizations and is used in pretty much every field.

Stacked charts

Stacked bar charts are a little more complicated. Here, you are looking...