Do you mean Z score?
Z = (sample mean - pop. mean)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√(n-1)
If only one SD is provided, you can use just that to determine SEdiff.
Consider a population with mean = 43 and sd = 5.2. Calculate the x-score for an sample mean of 46.5 from a sample of size 35.
2 answers
mean = 5.2 sd= 1.6 find standard deviation of sample