OPMT5510DLChapter1Summary(3)

# OPMT5510DLChapter1Summary(3) - Chapter 1 Data and...

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Chapter 1 Data and Statistics Data are the facts and figures collected, analyzed, and summarized for presentation and interpretation. Statistics is the art and science of collecting, analyzing, presenting, and interpreting data. Elements are entities on which data are collected. A variable is a characteristic of interest for the elements. The set of measurements collected on each variable in a study is called an observation . There are four scales of measurements that determine the amount of information contained in the data and indicate the most appropriate data summarization and statistical analyses: Nominal – the data for a variable are labels or names used to identify an attribute of an element (may be non-numeric or numeric); Ordinal – the data for a variable demonstrate the properties of nominal data and the order or rank of the data is meaningful; Interval – the data for a variable demonstrate the properties of ordinal data and the interval between values is expressed in terms of a fixed unit of measure (always numeric); Ratio the data for a variable demonstrate the properties of interval data and the ratio of two values is meaningful. Note

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## This note was uploaded on 09/17/2011 for the course OPMT 1111 taught by Professor Yao during the Spring '11 term at Toledo.

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OPMT5510DLChapter1Summary(3) - Chapter 1 Data and...

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