Please find the Z stat

Homework Question 8, 9.4.59-T HW Score: 16.98%, 1.53 of 9 points Part 2 of 5 Points: 0.43 of 1 Save 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 V substantially reduced cost. Data are collected from a random sample of 400 subscribers. The results indicate that 97 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. a. At the 0.05 level of significance, is there evidence that more than 20% of the customers would upgrade to a new cellphone at a reduced cost? Determine the null hypothesis, Ho, and the alternative hypothesis, H,. YA. H: TS 0.20 OB. Ho: 12 0.20 H,: It > 0.20 H1: I