Statistics Chapter 3
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What is a historgram
graph that summarizes data
Show the percentage distribution between class intervals.
0-1000 the Class from 0 to 1000 is included anything over a 1000 is placed in the next interval.
Be sure to divide intervals by the percentages
- 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
- 7000-1000 = 15% () = Height of 5%
Area of Histogram Block
The area of a block is always going to be (
- Length = Intervals
- Height = Usually Percentage
Interval = 7000-10000 Height = 15% (for total area)
area = 15 % X 3 intervals (7k-10k) = 45% area
- Marital Status
NOT DISCRETE OR CONTINUIOUS
- Family Size
- Family Income
BOTH ARE DISCRETE AND CONTINUOUS
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.
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
Different Groups (Tabs) are made and compared
i.e. User and non-user.
Selecting Breeding consist of breeding certain people or mice based on favorable characteristics
I.e. Intellegence, Physical ability...
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