Multiply them as you would any two numbers.
However, you should note that the standard deviation of a product of two variables is not the product of their standard deviations.
That is, SD(XY) ≠SD(X)*SD(Y)
Chat with our AI personalities
The sum of standard deviations from the mean is the error.
95% is within 2 standard deviations of the mean.
The mean for the WISC, like the WAIS, is 100. The deviations from 100, or standard deviations, are 15.
2 times the standard deviation!
Z-Score tells how many standard deviations a measurement is away from the mean.