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What are the Measures of Central Tendency?
Mode, Median, and Mean
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What is the Mode of a data set?
- The value that occurs most often
- Not every data set has a mode.
- The Mode is not very stable, changing just one number in a data set can change the Mode dramatically.
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What is the central value of an ordered distribution?
- The median
- To find it: Order the data
- For an odd number of data values in the distribution: Median + Middle data value
- For an even number of data values in the distribution: Sum of middle two values/2 = Median
- For an ordered data set of size n: Position of the middle value = n+1/2
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What is the avearge that uses the exact value of each entry called?
- The Mean
- To compute the Mean: Mean = Sum of all entries/Number of entries
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What is the notation used to indicate the sum of all data?
X
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What is the symbol used to represent to sum all the entries in the distribution?
summation symbol
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What is the Range?
The difference between the largest and smallest values of a data distribution.
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