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

Calculating percent change and percent difference

Percent change and percent difference are very similar concepts, but they have slightly different equations. In the exam, you will be expected to not only be able to calculate each but also understand when to use each. Be careful, the exam may have the correct answers to both equations as possible choices, so you can’t just calculate both and see which is on the list of answers.

Percent change

When thinking about percent change, the word you need to focus on is change. The idea is straightforward; you are concerned with how a single value has changed from point A to point B. You are just reporting this change as a percent, in reference to the starting value. When we say “in reference to a starting value,” we are trying to communicate that the starting value is the star of the show. It is subjective; all of this is told in terms of the starting value. Does the value increase or decrease since the starting value...