Please answer the questions in excel and show the formulas used and the step by steps. Thank you, I rate :)

2-Year Salary	4-Year Salary
64,000	81,600
65,000	76,300
72,000	61,000
68,000	60,200
79,000	59,000
82,000	68,600
70,000	51,900
64,000	67,600
81,000	78,900
77,000
59,000
88,000

Are the datasets used for the two groups dependent or independent?

Using the data from the previous problem, calculate a confidence interval for the difference of means. Report the interval and provide an explanation of whether it indicates a significant difference in earning power between the two groups.