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 135 of the subscribers would upgrade to a new cellphone at a reduced cost. Complete parts​ (a) and​ (b) below.       Question content area bottom Part 1 a. Construct a 99​% confidence interval estimate for the population proportion of subscribers that would upgrade to a new cellphone at a reduced cos

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