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I need help with Statistics

Statistics
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427 women, 29% of them shop online

b. Find a 95% confidence interval estimate of the percentage of all women who purchase books online. c. Can we safely conclude that less than 50% of all women purchase books online? Why or why not? d. Can we safely conclude that at least 25% of all women purchase books online? Why or why no e. What do the results tell us about the percentage of men who purchase books online?
Apr 11th, 2015

the question is not clear, so can't do b), reason is shop online is not equivalent to buy books online.  C. we can say that, because 

standard deviation is sqrt(0.29*0.71/427) =  0.022, 

z = (0.5-0.29)/0.022 = 12.72 , pr (p<0.5)  = pr(z<12.72)~1. 

since less than 50% shop online, so less than 50% buying book online. 

d. we can't reason is same as b, shop online is not equivalent to buying book online.

Apr 12th, 2015

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