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Lecture_02,_Chap_2,_Sec_1,_2a

Lecture_02,_Chap_2,_Sec_1,_2a - Descriptive Statistics...

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Descriptive Statistics Chapters 2 through 4 cover Descriptive Statistics After we collect the raw data (from a sample survey or a designed experiment), we can Describe the data using visual methods (charts, etc.) Describe the data using numeric methods (averages, etc.) Different methods are appropriate for different types of data
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Sullivan – Statistics : Informed Decisions Using Data – 2 nd Edition – Chapter 2 Introduction – Slide 2 of 36 Chapter 2 Organizing and Summarizing Data
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Sullivan – Statistics : Informed Decisions Using Data – 2 nd Edition – Chapter 2 Section 1 – Slide 3 of 36 Chapter 2 Section 1 Organizing Qualitative Data
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Organizing Qualitative Data Learning objectives Organize qualitative data in tables Construct bar graphs Construct pie charts 1 2 3
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Organizing Qualitative Data Raw qualitative data comes as a list of values … each value is one out of a set of categories These values can be organized as either a long list or in a table Interpreting the list of data can be difficult, particularly if there is a lot of data Methods are needed to aid interpretation
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Organizing Qualitative Data Qualitative data values can be organized by a frequency distribution A frequency distribution is a table that lists Each of the categories The frequency, or the count, for each category
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Organizing Qualitative Data A simple data set is blue, blue, green, red, red, blue, red, blue A frequency table for this qualitative data is The most commonly occurring color is ______ Color Frequency Blue ? Green ? Red ?
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Organizing Qualitative Data The frequencies are the counts of the observations The relative frequencies are the proportions (or percents) of the observations out of the total A relative frequency distribution lists Each of the categories The relative frequency for each category
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Organizing Qualitative Data Use the same simple set of data blue, blue, green, red, red, blue, red, blue A relative frequency table is computed as follows Sum of all frequencies = _____ Blue has a relative frequency of _______ Green has a relative frequency of _______ Red has a relative frequency of _______
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Organizing Qualitative Data A relative frequency table for this qualitative data is A relative frequency table can also be constructed with percents Color Relative Frequency Blue ?
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