A telephone company wants to estimate the proportion of households that would purchase an additional telephone line if it were made available at a...

 A telephone company wants to estimate the proportion of households that would purchase an additional telephone line if it were made available at a substantially reduced installation cost. A random sample of 700 households is selected and the results indicate that 198 of the households would purchase an additional line at the reduced installation cost. Find a 99% confidence interval for the proportion in the population that would purchase an additional line at reduced installation cost.