a. Based on a sample of 4!] observations, a 95% condence interval for the mean is given as {-2.01; 0.39}. In this case, how large is the margin of error\"?I And how large is the standard error? {5 marks} 1'). Consider two variables X and Y, with means and standard deviations as in Table 6 below. Tobie if. steam and standard dmahom The correlation between the two variables is 43.57. Using the two variables, you estimate a regression model of the form: Y = b1: + th + e. W would be the magnitude of 131'? {5 marks} :2. Consider the following ten numbers: 1 8 1i] 3 T 23 13 27 2 9 3 Give the S-number summary. 1'Jliihat is the interquartile range? {5 marks}