1. Consider the following result from two independent random samples taken from Sample 1 Sample 2 two populations. X12225 X22201 a. Develop a 95% condence interval for the difference between two population means. b. Discuss the properties ofgood estimators. 2. The data below are the monthly starting salaries (in thousand naira) and cumulative grade point average (CGPA) of students who have obtained a bachelor's degree in science. CGPA a). Use the least square method to develop the estimated regression equation b). Predict the monthly starting salary for a student with a 4.5 CGPA c). Compute the coefficient of determination, r2. Comment on the goodness of the fit