A cellphone provider has the business objective of wanting to determine 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 400 subscribers. The results indicate that 99 of the subscribers would upgrade to a new cellphone at a reduced cost. Reducing the price will be profitable if at least 20% of the subscribers would upgrade. Complete parts (a) and (b) below. Adnd cost? a. At the 0.05 level of significance, there evidence that more than 20% of the customers would upgrade to a new cellphone at Determine the null hypothesis, Ho, and the alternative hypothesis, H, O B. Ho As0.20 O A. Ho R=0.20 H: a#0.20 H. >0.20 ОС. Но я20.20 H; z<0.20 O D. Ho: 1#0.20 H, = 0.20 What is the test statistic? ZSTAT = (Type an integer or a decimal. Round to two decimal places as needed.) What is the p-value? The p-value isO (Type an integer or a decimal. Round to three decimal places as needed.) What is the final conclusion? v the null hypothesis. There V sufficient evidence that the percentage of people who would upgrade to a new cellphone at a reduced cost is 20%. b. How would the manager in charge of promotional programs concerning cellphone upgrades use the results in (a)? The mananer V CInnest reducina the nrice Click to select your answer(s),