Aclinical trial tests a method designed to increase the probability of conceiving a girl. in the study 345 babies were born, and 276 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 with explanation:

Given : A clinical trial tests a method designed to increase the probability of conceiving a girl.

Also, in a normal case the probability of conceiving a girl is 0.5.

Let p be the proportion of girls born.

Then , we have

Sample size : n= 345

The sample proportion of girls born =

Critical value :

The confidence interval for population proportion is given by :_

Since the confidence interval do not contains 50% that means there is increase in the probability of conceiving a girl, then it can be concluded that we have statistical evidence that the the clinical trial method increase the probability of conceiving a girl.

b

2

−

b

b

3

+

7

b

2

+

14

b

+

6

%

−

3

b

3

+

7

b

2

+

14

b

+

6

%

step-by-step explanation:

answer is because 4×10=40

and 98×4= is 392

40,392