STATS HELP!!!

Find the sample size necessary to determine the proportion within 5% at the 10% level of significance when no preliminary estimated proportion is given.

Question

STATS HELP!!!

Find the sample size necessary to determine the proportion within 5% at the 10% level of significance when no preliminary estimated proportion is given.

amistre64 · Answer

we have a formula for the margin of error .... i believe it may be useful here

amistre64 · Answer

$$E=z\frac{\sqrt{pq}}{\sqrt n}$$

jim_thompson5910 · Answer

"when no preliminary estimated proportion is given." the convention is to assume p = 0.5 http://www.ltcconline.net/greenl/courses/201/estimation/ciprop.htm scroll down near the bottom of the page

amistre64 · Answer

yes, p = q = .5 i believe minimizes the error