(Q1): A sample of 4 students was taken from a large class of students. Their preparation time (x) and their test score (y) are shown in the Table below. Using simple linear regression1 we want to predict the exam score as a function of the preparation time. Preparation time in hours (x) Exam Score (y) (a) Use Excel Data Analysis menu item ( and then choose \"Regression method\" from the list ) to nd the slope and intercept of the bestt line. Paste the output from XL to show that you have run it. You can also attach a screenshot instead