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Reliability and Validity

INTRODUCTION Sociologist James A. Quinn states that the tasks of scientific method are related directly or indirectly to the study of similarities of various kinds of objects or events. One of the tasks of scientific method is that of classifying objects or events into categories and of describing the similar characteristics of members of each type. A second task is that of comparing variations in two or more characteristics of the members of a category. Indeed, it is the discovery, formulation, and testing of generalizations about the relations among selected variables that constitute the central task of scientific method.

second task is that of comparing variations in two or more characteristics of the members of a category. Indeed, it is the discovery, formulation, and testing of generalizations ... errors can be indexed by a measure of variability of individual item scores around the mean index score. Thus, an instrument which has a large measure of ...

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