Chap 2 - Chapter 2 Descriptive Statistics Tabular and...

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Chapter 2 Descriptive Statistics – Tabular and Graphical Methods A. Ways to Display Categorical Data 1. Distribution – just another way of saying what the data looks like when it is mapped out. There are different ways to map it however depending on your needs. a. Frequency Distribution – a table showing the actual number or frequency of times in each class. They are non-overlapping (i.e. don’t touch) b. Relative Frequency Distribution – gives the relative frequency (# in class / # overall or # in class / n). Can be in percent or decimal form. Note: n = total observations -see page 8, 9 these are just Bar graphs with percentages attached to them c. Pie Charts – gives us a sense of what categories exist and at what rates in a circular and pie form. It gives us frequency and relative frequency of a certain distribution. Graph 1: Pie Chart Table 1: where the data came from 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Sales Changes 20.4 27.4 90 20.4 d. Bar graph – Displays data in a bar form. Since we are looking at categories, the bars don’t touch. It can also show us frequency and relative frequency. 1
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Graph 2: Box Plot B. Summarizing or Ways to Display Quantitative Variables Note: when we are developing a frequency distribution for the data we want to make sure that the intervals are large enough to get a sense of what the data is showing us, but not so large that we lose sight of details. 1.
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Chap 2 - Chapter 2 Descriptive Statistics Tabular and...

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