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Chapter 4: Measures of Position
Figure 4-15:
Pictorial representation of Quartiles
Notes:
There are nine deciles and three quartiles
is called the first decile,
is called the second decile,
is called
the third decile, etc.
is usually referred to as the first quartile,
as the second quartile,
and
as the third quartile.
=
,
=
,
=
, …,
=
.
=
,
=
and ,
=
.
. That is, the 50
th
percentile, the 5
th
decile,
the 2
nd
quartile, and the median are all equal to one another.
Finding deciles and quartiles is equivalent to finding the equivalent
percentiles.
Section Review
Next we will use some of the concepts discussed in the previous sections to
help us determine whether there are outliers in a given data set.
e-Self Review