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CHAPTER 3 COMMONLY USED STATISTICAL TERMS

145 CHAPTER 3 COMMONLY USED STATISTICAL TERMST here are many statistics used in social science research and evaluation. The two main areas of statistics are descriptive and inferential. The third class of statistics is design and experimental statistics. Descriptive statistics involve the tabulating, depicting, and describing of col-lections of data . These data may be either quantitative or qualitative. They provide a picture or description of the properties of data collected in order to summarize them into manageable form. Inferential statistics are a formalized body of techniques that infer the properties of a larger collection of data from the inspection of that collection.

data points around their mean value. It is a mathemati-cal expectation of the average squared deviations from the mean. Inferential Statistical Tests Tests concerned with using selected sample data compared with population data in a variety of ways are called inferen-tial statistical tests. There are two main bodies of these tests.

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