>> Does anybody here know enough about statistics to come up with answers?
>
> That's what standard deviation (σ) on my old casio FX-180P is made for.

The standard deviation tells you how variable something is. However:

1. This, by itself, does not tell you how many measurements you need to 
take to achieve a given level of accuracy.

2. If you compute the SD from the data you gathered, then the SD itself 
may be inaccurate.

Post a reply to this message