hello i need help with these statistic questions please and thank you

question 7

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 124 oi 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 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, H0, and the alternative hypothesis, H\". [:1 A. H0: p#0.20 [:1 B. H0: p=0.20 H':p=0.20 H1:p#0.20 [:1 C. H0: p = 0.20 [:1 D. H0: p= 0.20 H':p0.20 What is the test statistic? z = [Type an integer or a decimal. Round to two decimal places as needed.) What is the pvalue? The p-value is (Type an integer or a decimal. Round to three decimal places as needed.) What is the nal conclusion? Y the null hypothesis. There Y sufficient evidence that the percentage of people who would upgrade to a new cellphone at a reduced cost is Y 20%. b. How would the manager in charge of promotional programs concerning cellphone upgrades use the results in {a}? The manager |:| suggest reducing the price. For each graph, indicate whether the shaded area could represent a pvalue. Explain why or why not. If yes. state whether the area could represent the pvalue for a one-tailed or a twotailed alternative hypothesis. (a) Q Choose the correct answer below. 0 A. The shaded area could not be a p-value because it does not include tail areas. 9 C) B. The shaded area could be a pvalue for a test with a twotailed alternative hypothesis since both tails are of equal size. ,. D O C. The shaded area could not be a p-value because it includes both tail areas. C) D. The shaded area could be a pvalue for a test with a one-1ai led alternative hypothesis because it includes tail areas. 2 0 2 [b] Q Choose the correct answer below. Q C) A. The shaded area could not be a ovalue because it includes tail areas on Iy. O B. The shaded area could be a pvalue because it includes tail areas only. i2\" C) C. The shaded area could be a pvalue because it does not include tail areas. C) D. The shaded area could not be a ovalue because it does not include tail areas