Can someone please help me with this. I read on wikipedia that the coefficient of Variance can be used when the measurements are of ratio scales but cannot be used on interval scales.
I know it is useful to use it to compare samples with completely units like the variance in your mass...
I'm and just somewhat confused about this topic.
Lets say I have a sample set A with sample size= 101 mean =10 and sample stdv of 1
then sample set B with sample size= 100 Mean=15 with sample stdv of 2.
If i add these two samples sets together I should get a new stdv that...