Faculty members at a large university have found that over the past several semesters that a cell phone rings in class on average 20 times per semester A reporter for the school newspaper claims that students are more courteous with their cell phones now than in past semesters and that the average has decreased The reporter finds that in a random sample of 19 classes the average number of times a cell phone rang last semester was 18 3 with a standard deviation of 2 7 calls Does the evidence support the reporters claim Perform a complete hypothesis test using a 5 level of significance a State the appropriate null and alternative hypotheses Ho 20 H Select 20 b Test your hypotheses and make and justify a statistical decision using the significance level of 1 Test Used Select p value rounded to 3 decimal places Select decision Select