SOLUTION: A random sample of 72 statics students was taken to estimate the proportion of students who also were in the math club.The 99% confidence interval was 0.438 to 0.642.Using this dat

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Question 1174555: A random sample of 72 statics students was taken to estimate the proportion of students who also were in the math club.The 99% confidence interval was 0.438 to 0.642.Using this data , what size whould necessary to estimate the true proportion to within 0.08 using 95% confidence
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
     u - ME = .438             
     u + ME = .642
      2u = 1.080    
 Sample Mean = .54

n = %28z%2FME%29%5E2+%28p%281-p%29%29%29

n = %281.96%2F.08%29%5E2+%28.54%29%28.46%29%29%29

Will let You finish it up.  
Important You are comfortable with Your calculator
Wish You the Best in your Studies.

 = CI	z = value
90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576