Section2-2 - Frequency Distributions A Bourhim Syracuse...

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Frequency Distributions A. Bourhim Syracuse University MAT121-Fall 2011 A. Bourhim (Syracuse University) Frequency Distributions MAT121-Fall 2011 1 / 13
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Frequency Distributions When working with large data sets, it is often helpful to organize and summarize the data by constructing a table (called a frequency distribution) that lists the different possible data values (either individually or by groups or intervals) along with the corresponding frequencies, which represent the number of times those values occur. Such table helps us understand the nature of the distribution of a data set. Objectives 1 Present a frequency table. 2 Construct a frequency table. 3 Construct a relative frequency table. 4 Construct a cumulative frequency table. Reasons for construction frequency table 1 Large data sets can be summarized. 2 We can analyze the nature of data. 3 We have a basis for constructing important graphs. A. Bourhim (Syracuse University) Frequency Distributions MAT121-Fall 2011 2 / 13
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Frequency table Consider the following table of 120 scores of an exam. Class Frequency 01-10 2 11-20 3 21-30 1 31-40 4 41-50 2 51-60 7 61-70 14 71-80 23 81-90 43 91-100 21 SUM= 120 This table is called a frequency table (or frequency distribution) Remark sample size=sum of all frequencies=120 A. Bourhim (Syracuse University) Frequency Distributions MAT121-Fall 2011 3 / 13
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