This bestselling textbook is designed to help students understand parametric and nonparametric statistical methods so that they can tackle research problems successfully. By working through this book carefully and systematically, those who may not have a strong background in mathematics will gain a thorough grasp of the most widely used statistical methods in the social sciences.

Measuring Variations in Achievement

6.1 Introduction

The measures of central tendency outlined in Sections 5.1 to 5.11 describe the typical achievement of a group. They tell us nothing however, of the way in which individuals within the group differ from one another in their achievement. To know how individuals vary we need measures of ...

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