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)
1
Part 1: Preparing Data
7
Part 2: Analyzing Data
13
Part 3: Reporting Data
19
Part 4: Mock Exams

Measures of Central Tendency and Dispersion

This is where you finally get to start analyzing data! For better or worse, there are some calculations that you will have to be able to perform in the actual exam. This is a part that a lot of people get stuck on because these aren’t things that data analysts calculate manually, but you do need to know them for the exam. Online testing centers should have a simple calculator built into the calculation questions, and an online document for taking notes. However, you will not be provided with the equations you are expected to know. Time to dust off some of those old math skills!

Before we jump into the equations, we will start by going over what a distribution is and some common distributions you might come across. Next, we will start with the simplest math, talking about measures of central tendency, how to calculate them, and when to use which. Then, we will go over measures of dispersion. We will focus on ranges and quartiles...