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3 things to look at when looking at distribution 

Definition
1. Shape 2. Center 3. Spread 


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Computed by determining the sum of all the values of the variable in the data set and dividing by the number of observations 


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Population arithmetic mean 

Definition
Computing mean (mew) using all the individuals in a population 


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Computing mean (xbar) using sample data 


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The value that lies in the middle of the data when arranged in ascending order (M) 


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A numerical summary of data is resistant if 

Definition
Extreme values relative to the data do not affect its value substantially 


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Mean smaller than median is skewed 

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Mean larger than media is skewed 

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Mean roughly equal to median is 

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The most frequent observation of the variable that occurs in the data set 


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If no observation of a data set occurs more than once 


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A data set with two modes that occur in the highest frequency 


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Definition
A data set with three or more data values that occur in the highest frequency 

