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 140 of the subscribers would upgrade to a new cellphone at a reduced cost. a. Construct a 99​%confidence interval estimate for the population proportion of subscribers that would upgrade to a new cellphone at a reduced cost.  __ < π < __ (Round to four decimal places as needed)

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