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Janet wrote:

"50 out of 1600 members = 3% of the total membership
can hardly constitute a basis for anything"

Janet,

It could constitute a valid "picture" of the population if somehow the 50 could
be picked at random.
That is, all 1600 members have an equal chance to be randomly picked.  Margin of
 error is a calculation,
but not worth the effort.

Ed

CG for mom 78/12