Chap_2 - chapter 2 Describing Data: Frequency Tables,...

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chapter 2 Describing Data : Frequency Tables, Frequency Distributions, and Graphic Presentation
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Chapter Goals After completing this chapter, you should be able to: Construct a frequency distribution Construct and interpret a histogram Create and interpret bar charts, pie charts, Present and interpret data in line charts and scatter diagrams
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Frequency Distributions What is a Frequency Distribution? A frequency distribution is a list or a table containing the values of a variable (or a set of ranges within which the data falls) . .. and the corresponding frequencies with which each value occurs (or frequencies with which data falls within each range)
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Why Use Frequency Distributions? A frequency distribution is a way to summarize data The distribution condenses the raw data into a more useful form. .. and allows for a quick visual interpretation of the data
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Frequency Distribution: Discrete Data Discrete data: possible values are countable Example: An advertiser asks 200 customers how many days per week they read the daily newspaper. Number of days read Frequency 0 44 1 24 2 18 3 16 4 20 5 22 6 26 7 30 Total 200
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Relative Frequency Relative Frequency : What proportion is in each category? Number of days read Frequency Relative Frequency 0 44 .22 1 24 .12 2 18 .09 3 16 .08 4 20 .10 5 22 .11 6 26 .13 7 30 .15 Total 200 1.00 .22 200 44 22% of the people in the sample report that they read the newspaper 0 days per week
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This note was uploaded on 03/22/2012 for the course FINA 210 taught by Professor Dakroub during the Spring '12 term at American University in Cairo.

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Chap_2 - chapter 2 Describing Data: Frequency Tables,...

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