a). p = 80/400 = 0.2. confidence interval = 0.2 + or - z crit. sq rt (p x (1-p) )/400

= 0.2 plug or minus 0.0392

= 0.16 to 0.239

b) Confidence interval indicates that the probability of true mean lying within this interval is 95%

c) sample size = (1.96) ^2 (0.5) (0.5)/ (0.01)^2 = 960.5

Select next size so n= 961

Sample size n= 961

Hi Niru B, thank you so much for you kindly help. Do you have time to help me figure out another question

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