Please solve all parts for Econ stats

3. Starting annual salaries for individuals with master's and bachelor's degrees in business were collected in two independent random samples. a. Use the following data to develop a 90% condence interval estimate of the increase in starting salary that can be expected upon completion of a master's program. b. Use a: = .05 and test whether or not the master's starting salary is higher (don't assume the population variances are equal)