Question 1197464
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Hi  
 n = 200,  p = 68/200 = .34  and q = .66 
90% confidence interval ⇒  z = 1.96  2-sided Invnorm(.95) = 1.645
ME = {{{z*sqrt((p(1-p))/n) = 1.645*sqrt((.34)(.66)/200))}}}= .055
.34 - .055 < p < .34 + .055
.285 < p < .395
 0r
p = .34 ± .055

Wish You the Best in your Studies.
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