20 of 37 (12 complete) HW Score: 27.03%, 10 of 37 pts Score: 0 of 1 pt Question Help Instructor-created question 19A telecommunications 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. Data are collected from a random sample of 500 households. The results indicate that 170 of the households would purchase the additional telephone line at a reduced installation cost. Complete parts (a) and (b) below. - a. Construct a 95% confidence interval estimate for the population proportion of households that would purchase the additional telephone line. STS (Round to four decimal places as needed.) b. The margin of error e= (Round to 3 decimal places as needed.) c. The critical value for the upper tail is (Round to 2 decimal places as needed.) d. How would the manager in charge of promotional programs concerning residential customers use the results in (a)? O A. The manager can infer that 95% of households would purchase an additional telephone line. O B. The manager can infer with 95% confidence that the proportion of households in the sample that would purchase an additional telephone line is somewhere in this interval. O C. The manager can infer with 95% confidence that the population proportion of all households that would purchase an additional telephone line is somewhere in this interval. interval 95% of the time. O D. The manager can infer that the true population proportion of households that would purchase an additional telephone line is somewhere in this