Why doesn't "Change.. Number Format" work on my results sheet?

The number format dialog only works when a column contains a data set. For the results of some analyses, it wouldn't make sense to use the same number of digits for each value reported. The "Number Format" dialog doesn't work in those cases, and it shouldn't appear to be available. The problem is fixed in version 4.

BUT....notice that some analyses (e.g., Column Statistics, Nonlinear Regression) let you control the number of significant digits for each value on the Results sheet. Make that choice at the bottom of the Parameters dialog for your analysis. To make changes to the parameters, go to the results then click "Change... Analysis parameters...".