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Question 4 In a recruitment program arranged by an IT company, each trainee watches a selfstudy video before taking a screening test. The research team is investigating the relationship between the number of minutes the trainee spent on the self-study video and the score obtained by the trainee in the screening test. The following is 8 sets of data obtained in the study: x:numberofminutes 162 175 181 150 155 154 169 172 to nish the video (a) Calculate the correlation coefcient of the above data. (1 mark) (b) Comment on the relationship between the time the trainee spent on the self-study video and the score obtained in the test by referring to your answer in part (a). (2 marks) (c) Find the values of a and b in the regression line y = a + bx of the above data. (2 marks) (d) Interpret the value of b in the regression line in part (c). (1 mark) (e) Use the regression line in part (c) to estimate the score of a trainee who spends 160 minutes on the self-study video. (2 marks) (f) Comment on the reliability of the estimation in part (e) with reason. (2 marks)