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## Statistics

Math topics

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### Statistics

Statistics is the science of data.

Individual: An object described by data
Variable: Characteristic of the individual

Categorical Variable: Places individual into one of several groups or categories.
• Pie charts show the distribution of a categorical variable as a "pie" whose slices are sized by the counts or percents for the categories. All items must be of the same family.
• Bar graphs represent each category as a bar whose heights show the category counts or percents. If there are a lot of items, it is best to use a bar graph.
Quantitative Variable: Takes numerical values for which arithmetic operations make sense.
• Histograms show the distribution of a quantitative variable by using bars whose height represents the number of individuals who take on a value within a particular class.
• Stemplots separate each observation into a stem and a leaf that are then plotted to display the distribution while maintaining the original values of the variable.
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Jessica
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Sapphire

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### Re: Statistics

• 0

Tales of Ostlea :
Dragon Cave :
Magistream :

Jessica
Board Owner
Topic Author

Sapphire

Posts: 3,470
Topics: 1,244
Articles: 30
Joined: December 22nd, 2010, 8:04 pm