Page 1 of 1

Statistics

PostPosted: September 14th, 2013, 3:05 pm
by Jessica
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.

Re: Statistics

PostPosted: September 29th, 2013, 12:55 am
by Jessica
Image


Image


Image