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

Common Techniques in Descriptive Statistics

This chapter has a lot of fun content. This is another chapter of calculations that you will have to know for the exam, so brace yourself and put your math hat on. That said, they are descriptive statistics techniques that are commonly used and good to know. First, we will go over frequencies and percentages. Then, we will talk about how to calculate percent change. Next, we will discuss percent difference, as it is not the same thing as percent change. Then, we will cover confidence intervals. Finally, we will go over z-scores and how they are used. Without further ado, let’s get started!

In this chapter, we’re going to cover the following main topics:

  • Understanding frequencies and percentages
  • Calculating percent change and percent difference
  • Discovering confidence intervals
  • Understanding z-scores