1
Q
What do box plots show?
A
The spread of a data set.
It shows you the minimum and maximum values in a data set.
2
Q
What is the lower quartile?
A
The values of the first 25%
(n of values + 1)/4
3
Q
What is the median quartile?
A
The values of the first 50%
(n of values + 1)/2
4
Q
What is upper quartile?
A
The values of the first 75%
3(n of values + 1)/4
5
Q
What is the Interquartile Range or IQR?
A
The difference between the upper quartile and the lower quartile.
It contains the middle 50% of values.
6
Q
Why is the IQR more reliable measure of the spread than the range?
A
It isn’t effect by outliers as it is the middle 50%
Maths Averages and Spread
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