Please answer question a,b,c

Mathematics
Tutor: None Selected Time limit: 1 Day

Apr 24th, 2015

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

Apr 24th, 2015

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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Apr 24th, 2015

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