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Transcript
Statistics
St
Collection, drawing, displaying
and interpreting data sets
Average
A
A value that is said to be
representative of a set of data;
there are 4 main averages
Mean
Av
An average; found by adding all
the data values and ÷ by the
number of items
Median
Md
The middle value from a data set
when placed in size order
Mode
Mo
An average; the most commonly
occurring data value
Range
Rg
The difference between the
highest and the smallest values in
a data set
Pie Chart
Pc
A circle used to display data. The
angle of each sector is
proportional to the frequency
Probability
P
A measure of how likely an
“event” is
Table
Tb
An arrangement of information,
usually in columns and rows
Cumulative frequency
CF
Sum of all the frequencies;
produces an “S” shaped curve
… sort of
Box Plot
Pl
A way of representing data sets.
Shows: Median, LQ, UQ and IQR
Discrete
Dc
Data can only take certain values.
Usually data that is counted i.e.
students, games
Continuous
Cs
Data that is not restricted to any
value. Usually data that is
measured i.e. length, weight
Interval
Iv
A class or group in a
frequency table
Modal class
Mc
The class interval with the
highest frequency