n= (z a/2) 2 x p ( 1-p) /e^2. Where p =50 z= 1.6834 for 80 % confidence and e = 3

= (1.28)^2 x 50 x 50/9

= 467.8. Take the next size sample, so n= 468

If 85 % confidence interval then

n= (1.42) ^2 (50) (50) / 9

=. 560.1 the next size sample = 561

I have answered your question.

Niru

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