Hypothesis Testing a] Faculty members at a large university are irritated by students' cell phones and complain that a cell phone rings in class on average 15 or more times per semester. A reporter at the school newspaper thinks that students are now more courteous. The reporter asks a random sample of 2'3- teachers to keep track of the number of times a cell phone rings during the semester. The sample mean is 13.9 with a standard deviation of 2.? calls. a] Test the faculty claim that the mean number of times per semester that a cell phone rings in class is at least 15 times at o = {1.05 signicande level. In} Interpret your decision from part {a}. Which type of error, Type | or Type II, might you have made when performing this hypothesis test? Explain your answer in detail