suppose the data has variance 16 , what does this logically means ?(Doh)

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- Mar 12th 2009, 04:48 AMkashif shahvariance
suppose the data has variance 16 , what does this logically means ?(Doh)

- Mar 12th 2009, 01:19 PMdeltahunter
That would mean that most data points vary about 16 away from the mean. So if you were plotting test scores, and the mean was 78, then a variance of 16 would mean that most points would vary from 62 to 94. Also standard deviation is the square root of the variance, which would be 4.

- Mar 12th 2009, 06:52 PMmr fantastic
- Mar 18th 2009, 08:43 AMkashif shahvariance
what is logical interpretion of variance ?

i.e. if a data has variance 36 , what does it mean logicaly ?

also the same data has standard deviation 6 , to me it makes sense that spread about mean of the data is about 6 , how can we think about variance 36 for the same data ?