Chapter 13

Correlation Analysis

LEARNING OBJECTIVES

After studying this chapter, you should be able to

  • express quantitatively the degree and direction of the covariation or association between two variables.

  • determine the validity and reliability of the covariation or association between two variables.

  • provide a test of hypothesis to determine whether a linear relationship actually exists between the variables.

Nothing is good or bad by comparison.

–Thomas Fuller

13.1 INTRODUCTION

The statistical methods, discussed so far, are used to analyse the data involving only one variable. Often an analysis of data concerning two or more quantitative variables is needed to look for any statistical relationship or association between them that can ...

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