Yes, indeed, significant digits is certainly one of the terms I need. I couldn't for the life of me remember that term, nor the closely related 'margin of error' when I first wrote my original post...
Googling with "significant digits" hasn't yet led me to how to answer the question.
I did find this link to a pdf discussing estimation of required significant digits, and I think it very likely applicable to my question, but the paper is far enough above my head that I'm unable to use that link without further assistance.
Update: Ack, I hadn't seen trammell's post below when I posted this, I'm studying it now...
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||