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6. (a) The following table shows the amount of melted plastic (in grams) at various temperatures of the plastic (in Celsius). Temperature (Celcius) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 Melted Plastic (in grams) 8.1 7.8 8.5 9.8 9.5 8.9 8.6 10.2 9.3 9.2 10.5 (i) Find the linear regression equation of the amount of melted plastic vs. temperature. 3 marks] (ii) Estimate the amount of melted plastic at temperature 1.75 Celcius. [1 mark] (iii) Calculate the coefficient of correlation and comment on the relationship between temperature and amount of melted plastic. [2 marks] (iv) Calculate the Spearman's rank correlation coefficient for the above data. [2 marks]