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A cellphone provider has the business objective of wanting to determine the proportion of subscribers who...

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 600 subscribers. The results indicate that 141 of the sub-scribers would upgrade to a new cellphone if atleast 20% of subscribers would upgrade
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?
b. How would the manager in charge of promotional programs concerning residential customers use the results in (a)?

Please show all step, such as z stat critical values etc. they all are individual parts

Math   Statistics-And-Probability   
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