Measuring Usability
Quantitative Usability, Statistics & Six Sigma by Jeff Sauro

Crash Course in Z-Scores

Download an effective and complete 51 page course on how to compute, interpret and use of one of the most important concepts in statistics: z-scores.
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    $26.99     Now :  

If you will be making copies or distributing the product, please purchase the site license

This course can also be purchased for a discount as part of the zScore Package.


Features & Benefits

This 40 page report contains:
  • 27 diagrams and images
  • 27 Review Questions with detailed answers and explanations
  • A pictorial review of the mean, standard deviation and normal distribution and how they relate to z-score
  • How to use z-score tables and software
  • A look-up table of z-score to percent
  • A look-up table of percent to z-scores
  • How to find the area from a z-score
  • How to find a z-score for a percent of area
  • How to find a z-score for a single data-point and a sample mean

Who Should Buy

  • For complete newbies: This course assumes no prior statistics knowledge and provides an approachable and complete way of mastering z-scores in 11 lessons.
  • Course instructors who want a thorough and visual way to teach this fundamental concept.


  • For anyone wanting an easy and quick review of z-scores.


Table of Contents

Measuring the Center of Data (Mean)
Measuring the Variability of Data (Standard Deviation)
  Range
   Mean Absolute Deviation (MAD)
Variance & Standard Deviation
The Normal Distribution
The Empirical Rule
Normal Scores (Z-Score)
Percentile Scores
Area under the Normal Curve
   Using Software
   Using Tables
Area Above & Below a Point
Area below a Point
Area above a Point
Area Between
Converting Z-Scores back to Raw Scores
Z-Scores for Sample Means
   Standard Error
   Sample Means Vary Less than Raw Values
Some Frequently Asked Questions
Answers to Quick Reviews
Z-Score to Percentile Rank Table
Percentile to Z-Score Table
About the Author

Select Sample Screen Shots

A Compact & Comprehensive Crash Course

A Compact & Comprehensive Crash Course

Table of Contents

Table of Contents

Table of Contents Continued

Table of Contents Continued

Many Examples & Images to reinforce the concepts

Many Examples & Images to reinforce the concepts

Understand the concepts through Visualizations

Understand the concepts through Visualizations

Step-by-Step guides for reading normal tables

Step-by-Step guides for reading normal tables

Pictorial review of the standard deviation & variance

Pictorial review of the standard deviation & variance

Preview of all 51 Pages

Preview of all 51 Pages

Topics Covered

  • Interpreting a z-score
  • Percent of area above a z-score
  • Percent of area below a z-score
  • Percent of area BETWEEN two z-scores
  • Standard Scores
  • The Empirical Rule
  • Z-Scores for a sample Mean
  • Standard Error of the Mean

What Customers are Saying:

There is very little provided in any textbooks on z-scores (including AP Statistics). Your course is much more thorough (covering histograms, z-scores, and interpreting data values) and is designed to learn right from the file. We're using it in 5 classes.

Bert Shoemaker
Mathematics Professor
Evans High School
Evans, GA


    $26.99     Now :  

If you will be making copies or distributing the product, please purchase the site license All major credit cards, debit cards and PayPal Accepted.
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