In an experiment, the independent variable is the percentage of hydrocarbons and the dependent variable is the purity of oxygen produced in a chemical distillation process that are present in the main condenser of the distillation unit. The simple linear regression and correlation analysis is performed in a sample of 9 observations. Results are as shown below: SSxy = -19.5667 SSyy = 2.2156 a = 4.1304 b = -0.0171 (a) Develop the equation of the simple linear regression line for this data. Then, give a brief interpretation of the values of the linear correlation coefficient, the intercept and the slope. [9 marks] (b) Test the hypothesis that the slope is negative at the 1% significance level. [12 marks] (c) Construct an 98% confidence interval for B. Interpret your