APPENDIX

A Crash Course in Fundamental Statistical Concepts

Introduction

Throughout the book we’ve attempted to provide as much statistical background as possible without letting it get too overwhelming. In this appendix we review some fundamental statistical concepts and provide pointers to chapters where the concepts are covered in greater detail. If you’ve never had an introductory statistics class or don’t remember basic concepts such as measuring central tendency and variability, then you can use this appendix for a quick review.

Types Of Data

The first step in using statistics to make better decisions is to obtain measurements. There are two major types of measurements: quantitative and categorical. Task time, number of usability problems, ...

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