Re: Standard Deviation & the 68-95-99.7 rule

In article
Maya <maya_souj@xxxxxxxxxxx> wrote:

Among other things, this sort of information is used in statistical
hypothesis testing, q.v.

IN what way? What would be a simple example of the good of knowing
only the SD without knowing which type of distribution the data set is?

Knowing the SD alone is not likely to be useful, but knowing both the
mean and SD can be.

As explanations of how they are useful tend to be long and involved,
perhaps you should find an elementary statistics text from which to get
a thorough explanation.