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 500 subscribers. The results indicate that 120 of the subscribers would upgrade to a new cellphone at a reduced cost Reducing the price Will be protable if at least 20% of the subscribers would upgrade Complete parts (a) and (b) below a. At the 0.05 level of signicance, is there evidence that more than 20% of the customers would upgrade to a new cellphone at a reduced cost? Determine the null hypothesis. HD. and the alternative hypothesis, H1 . O A. H03 1:2 0.20 O B. H021:=0.20 H1: 1r 0.20 What is the test statistic? ZSTAT : (Type an integer or a decimal. Round to two decimal places as needed.) What is the pvalue'? The pivalue is . [Type an integer or a decimal. Round to three decimal places as needed.) What is the nal conclusion? V the null hypothesis. There V sufcient evidence that the percentage of people who would upgrade to a new oellphone at a reduced cost is V 20%. b. How would the manager in charge of promotional programs concerning cellphone upgrades use the results in (a)? The manager V suggest reducing the price