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

Practice questions and their answers

Let’s try to practice the material in this chapter with a few example questions.


  1. If a web service is synchronous, it means…
    1. Your system will wait for a response before continuing
    2. Your system does not have to wait for a response
    3. You are syncing a web service to your system
    4. Web services cannot be synchronous
  2. When conducting a survey, it is best practice to ask about specific events that happened in the past and request a text-based answer. True or false?
    1. True
    2. False
  3. ETL stands for…
    1. Extract, Transmit, Load
    2. Estimate, Time, Load
    3. Extract, Transform, Load
    4. Exact, Time, Load
  4. The process of taking transactional data that has already been stored, aggregating it, and moving it to a data warehouse is called what?
    1. OLTP
    2. OLAP
    3. API
    4. Web service
  5. You are provided with a long and complicated query that takes a long time to run, but you need several pieces of information from it. What is the most efficient approach?
    1. Run the query...