1.) The following data gives annual salaries (in thousands) of randomly chosen employees with college degrees. Some of these employees have only Bachelors' degrees and some have Masters'/PhDs. At a=0.05, can we claim that the mean salaries of employees with Bachelors' degrees are lower? Bachelors': 89 78 67 89 100 65 45 37 68 68 78 80 Masters'/PhDs: 120 130 78 69 88 101 112 160 200 88 Test using: a.) a hypothesis test b.) a confidence interval of them use