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Topic: Test for Proportions/t-test
Replies: 2   Last Post: Apr 9, 1997 5:12 PM

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Rudy Wiegand

Posts: 12
Registered: 12/6/04
Test for Proportions/t-test
Posted: Apr 8, 1997 5:36 PM
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In teaching my classes, I've always stressed that under the usual
assumptions with variance unknown, the t-test is appropriate and should
always be used; however, a student recently posed a question which I could
not answer. If doing a C.I. on proportions you don't know p, then you also
don't know the variance. The question the students asked was Why don't we
use the t-value when we form a C.I. on a proportion?

There is a great deal of logic to their question since clearly p is not
normal. Anyone with any ideas?

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