Originally Posted by msonic
This thread is chock full of intelligent sentient beings. Ask away.
She wants to know:
when to use the deviation method and when to use the raw score method when finding the standard deviation (shes using the deviation formula for a population set
square root( sum of x-mean of population squared over N))
when you know the data consists of raw socres or sample scores, or whether or not its been converted to z scores.