0
procedure:
step 1: arrange your raw data in increasing order.
step 2: find the Q1 is the size of the (n+1)/4th value.
step 3: find the Q3 is the size of the 3(n+1)/4th value.
Quartile Deviation(QD)= (Q3-Q1)/2
for example: 87 ,64,74,13,19,27,60,51,53,29,47 is the given data
step 1: 13,19,27,29,47,51,53,60,64,74,87
step 2: (n+1)/4=3 therefore Q1=27
step 3: 3(n+1)/4=9 therefore Q3=6
implies QD=18.5
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Explain the purpose of calculating standard deviation and quartile deviation?
Standard deviation helps planners and administrators to arrive at a figure that could be used to determine a range that can effectively describe a given set of numerical information/data; and based on which a decision concerning a system of those data can be made.
Uses of quartile deviation?
This helps to show where things may not follow the norm. Quartiles help you to keep data organized and so a deviation would show how it would vary.
Can interquartile range be used for any data eg data below the lower quartile to find if the data is spread out or close together or must we use the lower quartile for data below the lower quartile?
No, interquartile range cannot be for any data. The lower quartile for data must be used below the lower quartile.
How do you find the Quartile of a number?
A number does not have a quartile, a set of data does. The lower quartile of a set of data set is a value, in the data set, such that a quarter of the date set are smaller and three quarters are larger. The upper quartile is defined similarly. The middle quartile, better known as the median, divides the data set in two.
What statistical measure tells you how to spread out the data are?
There are many:Range.Inter [ ] Range : where the middle part may be quartile, quintile, decile or percentile. Other options are possible but less common.Mean absolute deviation.Mean squared deviation (variance).Standard error.Standard deviation.
