find the z and p value

Question

In 1995 a national vital statistics report indicated that about 2% of all births produced twins. In the rate of twin births the same among very young mothers? Data from a large hospital found only 9 sets of twins were born to 527 teenage girls. 

Answer 1

two-sided 1-proportion-z-test:

 

H₀: p₀=0.02

H_a: p₀≠0.02

 

X=9, n=527

 

Use TI-84 to find

 

z=-.479, P=0.632

 

Not significant at 10% level, don't reject H₀.