Aclinical trial tests a method designed to increase the probability of conceiving a girl. in the study 340 babies wereborn, and 306 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?
? < p < ?

does the method appear to be effective?

a. no, the proportion of girls is not significantly different from 0.5.
b. yes, the proportion of girls is significantly different from 0.5

B. Yes, the proportion of girls is significantly different from 0.5

Step-by-step explanation:

Given that a  clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 340 babies wereborn, and 306 of them were girls.

Sample proportion =

Std error of p =

For sample size large, we find that t distribution almost coincides with z distribution

Hence 99% critical value = 2.58

Margin of error = 2.58*std error = 0.0420

Confidence interval =

=

0.858<p<0.942

Yes, this method is effective becuse lower bound itself is 0.858 i.e. there is 85.8%chance for getting girls in birth

B. Yes, the proportion of girls is significantly different from 0.5