Ted, Rolf & Peter,

Thanks for a truly educational (at least for me) thread.

I did indeed look up the article /"Interval Estimation for the 
Difference Between Independent Proportions: Comparison of Eleven 
Methods." /which I found here.

/http://psychology.stanford.edu/~jlm/pdfs/Newcombe98Proportions.pdf/

It's above my current synaptic level, but I did learn that someone is 
awfully concerned about the accuracy of R's undergirdings.  From this 
point on, I'm just going to enjoy the ride.

And Peter: Yes, I did question the accuracy of R because of the Minitab 
result, but that has been the nature of my approach to my mostly 
semi-scientific endeavors.  I do have your book "Introductory Statistics 
with R" as one of my several guides to this adventure.

Jack

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