Does secondhand smoke increase the risk of a low birth weight?

profiletutor4helpyou
question.docx
Home>Mathematics homework help>Numerical analysis homework help>Does secondhand smoke increase the risk of a low birth weight?

A 95% confidence interval for a population proportion yielded the interval (.678, .764). Show your work. 

1. Compute the margin of error.

2. Compute the sample proportion.

3. Will a 90% confidence interval be wider or narrower? Explain.