Microsoft Office Tutorials and References
In Depth Information
Deviating from the Middle
Figure 9-9:
Standardizing a
of data.
The STANDARDIZE function takes three arguments:
Data point
Mean of the distribution
Standard deviation of the distribution
For example, this is the formula in cell E7: =STANDARDIZE(B7,C$2,C$3).
Note how a few key properties of the distribution have changed after the
values are standardized:
The standard deviation is 1.
The mean is 0.
The standardized values fall within the range –1.77 to 1.72.
This third point is determined by using the MIN and MAX functions,
respectively, in cells I7 and I8. Having values fall in the range –1.7 to 1.7 allows the
values to be analyzed with the Areas Under the Standard Normal Curve table
mentioned earlier. That is, it’s a property of standard normal curves to have
all values fit into this range.
Here’s how to use the STANDARDIZE function:
1. Enter a list of numerical values into a column.
It makes sense if this list is a set of random observable data, such as
heights, weights, or amounts of monthly rainfall.
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