Megan would like to test whether the average commute time is noticeably different for students at two different high schools in her city, using a significance level of 0.05. In a sample of 51 students at High School 1, she gets a sample mean of 21.2 minutes and a sample standard deviation of 3.1 minutes. In a sample of 51 students at High School 2, she gets a sample mean of 17.9 minutes and a sample standard deviation of 4.9 minutes. Assume the population variances are equal. a) What are the null and alternative hypotheses? Ho: p s