BUEC 232 Chapter Notes - Chapter 3: Average Absolute Deviation, Interquartile Range, Central Tendency
18 Oct 2017
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Ch. 3 ā Descriptive Statistics
ā¢ Measure of Central Tendency: yield information about the center, or
middle part of a group of numbers
ā¢ Arithmetic mean: the average of a group of numbers ā computed by
summing all numbers and dividing by the number of numbers
ā¢ Population mean: represeī
¶ted īy the Greek letter īī
µuī ī¾the faī
¶īy Uīæ
ā¢ Median: the middle value in an ordered array of numbers
o Advantage ā extremely large or small numbers will not affect the
data
o Disadvantage ā not all the information from the numbers is used
ā¢ Mode: the most frequently occurring value in a set of data
o if there is a tie for most frequently occurring number, both are
listed ā then the data is said to be bimodal
o data sets with more than two modes are called multimodal
āŖ often used in determining sizes of clothing/ shoes to buy
ā¢ Percentiles: measures of central tendency that divide a group of data
into 100 parts
o there are 99 percentiles because it takes 99 divides to make 100
parts
o perīeī
¶tiles are īstair-stepī values
ā¢ Quartiles: measures of central tendency that divide a group of data into
four subgroups or parts
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find more resources at oneclass.com
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BUEC 232 Full Course Notes
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