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Dear Students,

Graded Discussion Board for STA301 will be opened on January, 03, 2013 and will be remained open till January 04, 2013.

The topic of this GDB will be,

“It has been said “less the variability exist, the more an average is representative of a set of data”. Comment on the meaning of statement”.

Post your comments after inferring the above topic. Your comments should NOT exceed from 100-150 words.

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Replies to This Discussion

“It has been said “less the variability exist, the more an average is representative of a set of data”. Comment on the meaning of statement”tha*.
Post your comments after inferring the above topic. Your comments should NOT exceed from 100-150 words.

Note: Discussion should be relevant. Irrelevant and unnecessary lengthy materials will not be considered.rock*






Answer:%)

The extent to which data points in a statistical distribution or data set diverge from the average or mean value. Variability also refers to the extent to which these data points differ from each other. There are four commonly used measures of variability: range, mean, variance and standard deviation.
OR
if data has less variability it means data will not have extreme values, so average will not be affacted,
it will represent the data more affective.
The extent to which data points in a statistical distribution or data set diverge from the average or mean value.
Variability also refers to the extent to which these data points differ from each other. There are four commonly used measures of variability: range, mean, variance and standard deviation.

It has been said “less the variability exist, the more an average is representative of a set of data

 

 

There are four commonly used measures of variability: range, mean, variance and standard deviation.

 

The variability of two or more than set of data cannot be compared unless we  have a relative  measure of dispersion.
For this purpose, Karl Pearson  (1857-1936) introduced a relative measure of variation,known as the co-efficient of variation, abbreviated C.V. which expresses the standard  deviation as a percentage of the arithmetic  mean of a data set

 

Variation is also used to compare the performance of two candidates or two players given their scores in various papers or games , the smaller the coefficient  of  variation the more consistent is the performance of the candidates or player.Thus it is used as a criterion for the consistent performance of the caqndidates of the players.

It should be noted that  this co-dfficient is unreliable when the arithmetic mean is very small.

Therefor form above discussion if data have less variability then it means that data will not have extreme values so avarage will not be affected.

bsh kr do ab sb kisi or asgmnt  gdb p  b nzr dalo 

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