[dhlvrsn]

The only limit that I saw listed for the calculator is that it cannot be a graphing or programmable one...

"Principles of Statistics tests the understanding of the various topics
of statistics, both qualitatively and quantitatively, and the ability to
apply statistical methods to solve a variety of problems. The topics
included in this test are descriptive statistics; correlation and
regression; probability; chance models and sampling and tests of
significance. The use of a nonprogrammable, handheld calculator is
permitted."

No mention of not being able to bring a calculator that handles stats. In fact I've been following the advise of many on this board and learning how to use my calc to do work.

Also I don't recall seeing the difference between sample and population standard deviation covered in instantcert. Did that come up on the test? I know how to calculate from the instructions in my calculator manual but could not describe it...