Chapter 02 - Sections 1 &amp; 2

# Chapter 02 - Sections 1 &amp; 2 - Descriptive...

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Unformatted text preview: 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 Fall 2008 1 Chapter 2 Organizing and Summarizing Data Fall 2008 2 Chapter 2 Organizing and Summarizing DATA Section 1 Organizing Qualitative Data Fall 2008 3 Organizing Qualitative Data Constructing a Frequency Distribution ● 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 ● 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 Fall 2008 4 Organizing Qualitative Data Constructing a Frequency Distribution ● 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 Fall 2008 5 Organizing Qualitative Data Constructing a Frequency Distribution ● 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 ? Fall 2008 6 Organizing Qualitative Data Constructing a Relative Frequency Distribution ● The frequencies are the counts of the observations ● The frequencies are the counts of the observations ● The relative frequencies are the proportions (or percents) of the observations out of the total ● 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 Fall 2008 7 Organizing Qualitative Data Constructing a Relative Frequency Distribution ● 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 _______ Fall 2008 8 Organizing Qualitative Data Constructing a Frequency Distribution ● 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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Chapter 02 - Sections 1 &amp; 2 - Descriptive...

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