what does it mean when sd is larger than mean? why is duration non negative why is sd larger than mean when a sd is bigger than the mean of a randomised control, the data is always positive. why is duration bigger than the mean in a study are the sds bigger than mean in randomised design which variable is not positive and which is not? is duration a mean or mean why do sds always be larger than the mean is duration a negative variable when is the sd larger than the mean in a control study what is sd larger than mean in study what is the difference between a negative sd and a negative sd what is the meaning of sd larger than mean is duration a normal variable is duration a negative variable what is the sd in a controlled trial can a study be negative if the duration is larger than the mean why are sds larger than mean why is sd more than mean