F
REQUENCY
T
ABLES
A
parameter
is a numerical characteristic of a population.
A
statistic
is a numerical characteristic of a sample.
A statistic is a single value that
summarizes some characteristic of interest.
There are many statistics that can be of interest.
Some of these statistics are measures of
central tendency such as the
mean
,
median
, and
mode
of a set of data.
The
mode
of a set of data is the most commonly occurring value in a series.
If we are
looking at classes, it is the class that contains the most entries (has highest frequency).
It is
possible to have one mode, more than one mode (bimodal, trimodal), or no mode at all.
The
mode is not the most useful of the measures of central tendency and is typically only used
when others are not available.
The mode will always be a value in the data series.
The
arithmetic mean
of a set of data is usually what people mean when they say average.
The mean is the sum of all the data values divided by the number of data values.
The mean
does not necessarily have to be a value in the data series.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Fall '08
 Kim
 Calculus, Statistics, Mean, Median, Mode, Mean

Click to edit the document details