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we calculate standard deviation to find the avg of the difference of all values from mean.,

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Q: Why we calculate standard deviation and quartile deviation?
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Related questions

If quartile deviation is 24. find mean deviation and standard deviation?

Information is not sufficient to find mean deviation and standard deviation.


What is coefficient of quartile deviation?

What is coefficient of quartile deviation?


Quartile deviation advantages disadvantages?

advantages of quartile deviation


Relation between quartile deviation and mean deviation?

mean deviation =(4/5)quartile deviation


What is the relation between quartile deviation and standard deviation?

Strictly speaking, none. A quartile deviation is a quick and easy method to get a measure of the spread which takes account of only some of the data. The standard deviation is a detailed measure which uses all the data. Also, because the standard deviation uses all the observations it can be unduly influenced by any outliers in the data. On the other hand, because the quartile deviation ignores the smallest 25% and the largest 25% of of the observations, there are no outliers.


What is mean deviation and why is quartile deviation better than mean deviation?

What is mean deviation and why is quartile deviation better than mean deviation?


What is the purpose of quartile deviation?

In a data sample, the purpose of quartile deviation is a way to measure data dispersion instead of using the range. The quartile deviation is found by subtracting the lower quartile from the upper quartile, and dividing this result by two.


How do you calculate the third quartile for a mean of 110 and a standard deviation of 15?

If this is the only information you have, the answer would be somewhere around 125. Usually, you would find the third quartile by first finding the median. Then find the median of all of the numbers between the median and the largest number, which is the third quartile.


What is the formula for coefficient of quartile deviation?

coefficient of quartile deviation: (Q3-Q1)/(Q3+Q1)


How do you calculate variance given standard deviation?

Square the standard deviation and you will have the variance.


What is quartile deviational?

Quartile Deviation (QD)The quartile deviation is half the difference between the upper and lower quartiles in a distribution. It is a measure of the spread through the middle half of a distribution. It can be useful because it is not influenced by extremely high or extremely low scores. Quartile Deviation is an ordinal statistic and is most often used in conjunction with the median.why we calculating quartile deviation?


What is the standard deviation of 9?

You need more than one number to calculate a standard deviation, so 9 does not have a standard deviation.