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First arrange the data set in ascending order.
Suppose the data set consists of n observations.
the index for the lower quartile is (n + 1)/4
and the index for the upper quartile is 3*(n + 1)/4.
Find the values that correspond to the number in these positions in the ordered list.
For example, if n = 15, then lower index = 4 and upper index = 12.
So the lower quartile is the fourth number and the upper quartile is the twelfth.
If n is large, you may skip the +1 and just look at n/4 and 3n/4.
Often the indices are not integers. Then, if you are a beginner (nd the fact that you asked this question suggests that you are), find the nearest whole numbers for the two indices. Otherwise you need to interpolate and that is a whole new ball game!
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What is a lower quartile?
A lower quartile i s the mediaon of the lower half of a data set. A data set is divided up into different quartiles.
How do you find the first and third quartiles?
37
How do you find a mean of a set of numbers?
to find the mean of a set of numbers you have to find the total sum of the data divided by the number of addends in the data.
What are the upper and lower quartiles?
The upper quartile of a set of data is a value such that a quarter of the observations are greater than that value. The lower quartile is similarly defined as the value such that a quarter of the observations are less than that value.
Find the mode of this set of data?
It has no mode.
