5. Saba & Alexandra, attorneys with the law firm of Not Babi P-hat, just P-hat Babi" famous for their motto "U Must B Dis Tall 2 Ryde Dis Ryde!" wanted to see if their firms' employees benefited from attending a one week effective marketing workshop. They sent six of their employees to the workshop and got the following "before" and "after" results (regarding sales). Before 9 9 6 3 8 4 After 10 7 6 4 9 Find a. d (2pts.) b. Sd (4pts.) c. Construct a 90% confidence interval for the mean of the population paired differences. (5pts.) d. Test at the 10% significance level whether attending this course increases the mean sales of their employees. (6pts.)