Question 1129555
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 355 babies were​ born, and 284 of them were girls. Use the sample data to construct a 99​% confidence interval estimate of the percentage of girls born. Based on the​ result, does the method appear to be​ effective? 
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p-hat = 0.8
Margin of Error:: z*sqrt[(0.8)(0.2)/355] 
= 2.5758*0.02123 = 0.0547
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99% CI:: 0.8-0.0547 < p < 0.8+0.0547
99% CI:: 0.75 < p < 0.86
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Cheers,
Stan H.
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