$\frac{2}{2}$

$($a$)(3$ pts$)$ Estimate the true ratio of Corroding Water Pipes symptom.

$($b$)(6$ pts$)$ Construct $98\%$ confidence interval for the true ratio of home water quality problem due to

Corroding Water Pipes symptom.

$($c$)(4$pts$)$ Is the sample size in part $($b$)$ enough to be correct within $0\mathrm{.}03$ of the true ratio? If not, determine

the required sample size.