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STAT 100 (65)
Chapter 12

Chapter 12 STATS.docx

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Department
Statistics
Course
STAT 100
Professor
Derek Bingham
Semester
Summer

Description
Chapter 12 Describing Distributions with Numbers Median and QuartilesMedian is the midpoint the value that separates the smaller half from the larger halfQuartilesget their name because with the median they device the observations into quartersTo findthe median 1 Arrange all observations in order of size smallest to largest 2 Find the location of the median by counting n12 observations up from the bottom of the list 3 If the number of observations n is even the median M is the average of the two center observations in the ordered listThe median to describe center the quartiles are spreadTo calculate quartiles 1 Arrange the observations in increasing order and locate the median M in the ordered list of observations 2 The first quartile Q1 is the median of the observations whose position in the ordered list is to the left of the location of the overall median The overall median is nto included in the observations considered to be to the left of the overall median 3 The third quartile Q3 is the median of the observations whose position in the ordered list is to the right of the location of the overall median The overall median is not included in the ob
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