A national report indicates that the mean and standard deviation of the ACT scores of incoming freshman at American public universities are 24.6 and...

A national report indicates that the mean and standard deviation of the ACT scores of incoming freshman at American public universities are 24.6 and 6.2, respectively. A sample of 30 incoming freshmen at a small, suburban college provide a sample mean of 22.8 and a sample standard deviation of 7.7. The researcher is interested in finding evidence at the .05 level that the standard deviation in ACT scores is different than the reported value for all public universities. What is the null and alternate hypothesis?