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If you mean the standard deviation, there are two shifted keys on the third row marked with a lower-case Greek sigma. sigma_xn is the population standard deviation and sigma_xn-1 is the sample standard deviation.
The formula for calculating a
z-score (or standard score) is:
z = (x - μ) / σ
The variables in the z-score
formula are:
z = z-score
x = raw score or observation to be standardized
μ = mean of the population
σ = standard deviation of the population
Example of a z-score
calculation:
You have an observation of 14.75, a population mean of 12.2, and a
standard deviation of 1.75. Therefore, the z-score would be:
z = (14.75 - 12.2) / 1.75
z-score = 1.46
The square root button is two up from the 9 key, just to the left of the divide key. To calculate the square root of 2, for example, press 2 square-root =
Put the data into a list using whatever scheme you prefer. Press STAT right-arrow to bring up the STAT CALC menu. Select "1-Var Stats" and specify the list containing the data. You'll get a screen showing the various statistical values. The population standard deviation is designated by a lowercase sigma.
There isn't one. Press the "STAT VAR" button to bring up the statistics menu. "Sx" and "Sy" will give you the sample standard deviations, while "sigma x" and "sigma y" will give you the population standard deviations.
When I say "sigma" I mean the lower case Greek letter sigma, which looks like a lower-case "o" with a tail pointing to the right.
Press 2nd [CSR] (shift-7) to clear the statistical registers. Use the Sigma+ key (just above STO) to enter data points. Use 2nd [Sigma-] to remove erroneous data points. Use 2nd [sigma x n] (shift-divide) to compute the population standard deviation, or 2nd [sigma x n-1] (just to the left of the previous key) to compute the sample standard deviation.
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