Subsections 2.2.1 and 2.2.2 indicate how data that take on only a relatively few distinct values can be described by using frequency tables or graphs, whereas Subsection 2.2.3 deals with data whose set of values is grouped into different intervals. Section 2.2 deals with ways of describing a data set. In this chapter we introduce the subject matter of descriptive statistics, and in doing so learn ways to describe and summarize a set of data. Ross, in Introduction to Probability and Statistics for Engineers and Scientists (Sixth Edition), 2021 2.1 Introduction A graphical technique, called the scatter diagram, for presenting paired value data is also introduced. The chapter also deals with sample percentiles and Chebyshev's inequality for sample data. The statistics are used to indicate the spread of the values in the data set and introduces the sample variance and its square root, called the sample standard deviation.
There are three statistics that are used to indicate the center of the data set: the sample mean, the sample median, and the sample mode. It also discusses ways of summarizing data sets by use of statistics, which are numerical quantities whose values are determined by the data. The chapter deals with data whose set of values is grouped into different intervals. To draw conclusions from data, it is necessary to have an understanding of the data's origin. This chapter discusses descriptive statistics and presents graphs and tables that describe a set of data, as are quantities that are used to summarize certain of the key properties of the data set. Ross, in Introduction to Probability and Statistics for Engineers and Scientists (Fourth Edition), 2009 Publisher Summary
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