a national news magazine claimed that the average out of state tuition for public universities in a seven state region is higher than the national average of $25670. a researcher at one of those universities collects tuition rates from a random sample of seven universities, determined that the mean tuition was $28922 with a standard deviation of $4622. at an alpha of .05, what would the observed balue for t be? What would the the critical value for a two tail test be, and what would the critical value for an upper tail test be? Can you show step by step