Collecting Data

# Collecting Data - Chapter Two Organizing and Summarizing...

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Chapter Two Organizing and Summarizing Data 2.1 Organizing Qualitative Data

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When data is collected from a survey or designed experiment, they must be organized into a manageable form. Data that is not organized is referred to as raw data. Ways to Organize Data Tables Graphs Numerical Summaries (Chapter 3)
A frequency distribution lists the number of occurrences for each category of data.

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EXAMPLE Organizing Qualitative Data into a Frequency Distribution The data on the next slide represent the color of M&Ms in a bag of plain M&Ms. Construct a frequency distribution of the color of plain M&Ms.
Yellow Orange Brown Green Green Blue Brown Red Brown Brown Orange Brown Red Brown Red Green Brown Red Green Yellow Yellow Red Red Brown Orange Yellow Orange Red Orange Blue Brown Red Yellow Brown Red Brown Yellow Yellow Blue Yellow Yellow Brown Yellow Green Orange

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Frequency table
The relative frequency is the proportion or percent of observations within a category and is found using the formula:

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