A clinical trial tests a method designed to increase the probability of conceivi

Question

A clinical trial tests a method designed to increase the probability of conceiving a girl In the study 365 babies were born, and 292 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the D-p«O(Round to three decmal places as needed ) Does the method appear to be effective? O Yes, the proportion of girls is significantly different from 05 percentage of grts born Based on the resu does the method appear to be et ctive? O No, the proportion of girls is not significantly different from 05

Explanation / Answer

n = 365 p^ = 292 / 365

z for 99% = 2.576

LCL = 292/365 - 2.576 * (292/365 * 73/365 / 365)

= 0.7461.

UCL = 292/365 + 2.576 * (292/365 * 73/365 / 365)

= 0.8539.

=> 0.746 < p < 0.854.

or 74.61% < p < 85.39%.

Yes the proportion of girls is significantly different from 0.5.

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