AT&T would like to test the hypothesis that the average revenue per retail user for Verizon Wireless customers equals $55. A random sample of 20 Verizon Wireless customers provided an average revenue of $60 and a sample standard deviation of $12.50. (a) Set up the appropriate null and alternative hypotheses to test whether the average revenue is $55. (2 pts) (b) Using a = 0.05 test perform the hypothesis test, making sure to clearly label all steps and calculations. Be sure to include the standard error (2 pts), the critical value(s) (2 pts), the test statistic (2 pts), and the p-value (2 pts). (c) Draw the appropriate hypothesis testing conclusions. What can you or can't you conclude about the average revenue per customer? (3 pts) (d) What assumptions need to be made about this population? (2 pts) Perform all of your calculations in an Excel spreadsheet. Clearly label the answers to the questions. Please include your name in the upper left corner. Upload the file containing your work