# Math Help - More Binomial Prob

1. ## More Binomial Prob

A fertility clinic claims to have a procedure for selecting the gender of a child. Among nine randomly selected couples who wished to have girls, seven got the intended result. Test a hypothesis to determine if the procedure does better than chance.

The answer is .0898; however, I obtained $9C7*.5^7*.5^2=.0703125$.

What is the issue here?

2. Originally Posted by dwsmith
A fertility clinic claims to have a procedure for selecting the gender of a child. Among nine randomly selected couples who wished to have girls, seven got the intended result. Test a hypothesis to determine if the procedure does better than chance.

The answer is .0898; however, I obtained $9C7*.5^7*.5^2=.0703125$.

What is the issue here?
The answer to what is 0.0898??

3. To the question about fertility.

4. Originally Posted by dwsmith
There is no "question" - you are testing a hypothesis.

5. Yes, I understand that. The probability of having a boy and girl is 50%.

So I used the binomial procedure.

6. Originally Posted by dwsmith
Yes, I understand that. The probability of having a boy and girl is 50%.

So I used the binomial procedure.
OK I get where the 0.07 came from just not sure where you got the 0.08 figure from

7. That is the books answers.

8. Originally Posted by dwsmith