Thread: range, inter-quartile range

How do I find the range of a set of data?
How do I identify the inter-quartile range?
What is the difference between the range and the interquartile range?

Originally Posted by mlbg

How do I find the range of a set of data?

Range - the length of the smallest interval containing the data, so
its the difference between the largest and smallest value in the sample.

How do I identify the inter-quartile range?

Quartile - one of the three values that divides the data into four intervals
each containing 25% of the data points. The first quartile cuts of 25%
of the points, the second quartile cuts of 50% of the points, also known as the median, third quartile cuts of 75% of the points.

What is the difference between the range and the interquartile range?

Interquartile range is the difference between the third and first quartiles.

RonL