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Statistics

Post Number: #1  Postby Jessica » September 14th, 2013, 3:05 pm

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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Re: Statistics

Post Number: #2  Postby Jessica » September 29th, 2013, 12:55 am

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Image
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