Re: Is this sample representative of the population?


"David Winsemius" <dwin$emiu$@comcast.net> a écrit dans le message de
news:dwin$emiu$-A6EA19.01435718122005@xxxxxxxxxxxxxxxxxxxxxxxxxxx
> Fine. You are worried about the second numbers in each row being a
> subset of the first? Subtract the second from the first, then do a
> general test of association on the proportions of responders and
> non-responders. You don't even need a statistical package. There are
> online resources.
>
> You could be underestimating your client. It seems perfectly possible
> that the client may be testing your ability to do a simple statistical
> test. This is first year stuff, even in marketing/business/psychology
> curriculums.
>

Thanks. Do you have a link where I could see this "general test of
association on proportions"? I've been googling over "general test of
association" and "proportions" and not getting anywhere.As to the textbooks
I have, they're all in French; the test of comparison of two proportions in
those is the one I already mentioned I used in my first post (except of
course, that I did not subtract the second set of numbers from the first).
It's a z-test similar to the comparison of two means. Is that the test
you're referring to?

I appreciate the comment that this is "first-year" stuff, but am still not
sure if this particular issue is all that clear. My boss has long worked in
marketing and sampling and didn't know any more about what to do than I did.

Z


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