The average age of students in a career college is 28 years with a standard deviation of 12 years. It is known that the age of the students follows a...

Hamilton / Shelby

Sample size 150 / 200

Number of "low-birth-weight babies 18 / 22

1. Develop a 95% confidence interval estimate for the difference between the proportions of low-birth-weight babies in the two counties?

2. Is there conclusive evidence that one of the proportions is significantly different from the other? Explain using the results of part a. Do not perform any test?