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?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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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