## Math Chapter 4

##### Created by:

chrgleason1991  on February 1, 2012

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# Math Chapter 4

 unimodala single, center-peaked distribution, a bell shaped curve
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#### Definitions

unimodal a single, center-peaked distribution, a bell shaped curve
bimodal Describes a distribution with two well-defined peaks.
symmetrical having similarity in size, shape, and relative position of corresponding parts
skewed a distribution is this if it's not symmetric and one tail stretches out farther than the other
historgram graphical representation of a frequency distribution using vertical bars but bars touch each other to indicate variables are related
when histogram is bimodal describe the symmetry of each cluster separately.
categorical variables Variables that represent or stand for a specific group rather then a specific number. Each category is a natural "pile".
quantitative variables numerical and can be ordered or ranked
no way to choose piles.
relative frequency histogram Has the same shape and horizontal scale as a histogram, but the vertical scale is marked with relative frequencies instead of actual frequencies
stem and leaf display A simple way to see how the data are distributed and where concentrations of data exist

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