# Statistics Chapter 3

 What is a historgram graph that summarizes data Distribution Table Show the percentage distribution between class intervals.  Endpoints  0-1000 the Class from 0 to 1000 is included anything over a 1000 is placed in the next interval.   Plotting Percentages Be sure to divide intervals by the percentages Example 0-1000          10%1000-2000     10%2000-3000     7%3000-5000     15% (Divide 15% x 2 intervals, which will equal 7.5%) 7000-10000   15%  (Divide 15% x 3 intervals, which will equal 5%)  Height of a Block To figure out the height of a block over a class interval, divide the percentage by the length of the interval example:7000-1000 = 15% () = Height of 5% Area of Histogram Block The area of a block is always going to be () or  (for triangles) Length = IntervalsHeight = Usually Percentage example: Interval = 7000-10000  Height = 15% (for total area) area = 15 % X 3 intervals (7k-10k) = 45% area Variables  QualitativeQuantitative  Qualitative  Single Marital StatusWidowedDivorcedSeparated NOT DISCRETE OR CONTINUIOUS Quantitative AgeFamily SizeFamily IncomeHeightWeight BOTH ARE DISCRETE AND CONTINUOUS Discrete The value can only vary by fixed amounts 0,1,2,3 and so on nothing can be in the middle. Example of this would be a family size.  Continuous Values lie in between variables. Example of this would be age and weight. The difference are minute. In age a person can be a minute, hour, day, week month, or year older than another subject. The Density Scale Represents crowing of blocks within a histogram Cross Tabulation Different Groups (Tabs) are made and compared i.e. User and non-user. Selective Breeding Selecting Breeding consist of breeding certain people or mice based on favorable characteristics   I.e. Intellegence, Physical ability...  pg. 48 Authordamea134 ID280036 Card SetStatistics Chapter 3 DescriptionHistogram Updated2015-08-06T02:00:34Z Show Answers