A cellphone provider has the business objective of wanting to estimate the proportion of subscribers who would upgrade to a new cellphone with improved features if it were made available at a substantially reduced cost. Data are collected from a random sample of 500 subscribers. The results indicate that 160 of the subscribers would upgrade to a new cellphone at a reduced cost. Complete parts (a) and (b) below.

a. Construct a 95% confidence interval estimate for the population proportion of subscribers that would upgrade to a new cellphone at a reduced cost. enter your response here enter your response here

(Round to four decimal places as needed.)