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
To the question about fertility.
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
That is the books answers.
Is the question that you posted word for word from your book. If it is then their "answer" doesn't make a lot of sense????

9. Word for word my friend.

10. Originally Posted by dwsmith
Word for word my friend.
How can the "answer" to "Test a hypothesis to determine if the procedure does better than chance" be a number???
Suggestion: Toss the book.

11. Trust me, I know the book is garbage.