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An executive at a telecommunications company is interested in the relationship between an individual's income and their mobile phone usage. He surveyed 12 mobile-phone users and recorded their annual incomes and time (in minutes) spent each week making national direct calls. The data is presented in sequence according to gross annual income. Individual Annual income 000 10 11 12 23 29 29 35 42 50 54 66 76 78 National direct calls minutes 69 95 102 118 126 125 138 178 156 184 176 225 a. b. c. d. Construct a scatter plot of the data above. (3 marks) Develop a least squares regression line to predict the direct calls in minutes based on annual income. (10 marks) What would be the predicted duration of direct call in minutes for an income of (3 marks) What is error value for an income of S76000? (4 marks)