Question

In 1991 a national vital statistics report indicated that about 2.3% of all births produced twins. Is the rate of twin births the same among very young​ mothers? Data from a large city hospital found only 9 sets of twins were born to 529 teenage girls. Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed.

Are the assumptions and the conditions to perform a​ one-proportion z-test​ met?

Use a normal model for the sampling distribution of the proportion and do a​ one-proportion z-test

Find the cumulative probability corresponding to the​ z-value

Use the​ P-value method to find the conclusion

Answer 1