2.a) Perform a Chi-squared Goodness of Fit test on the data shown in Table Q2a, and determine whether the observed values are consistent, at the 5% level, with the expected values. Table Q2a A B C D E Expected 106 163 195 184 135 Observed 118 139 175 202 149 (10 marks) b) Find a linear equation to best represent the data in Table Q2b, and calculate the correlation coefficient (r). Table Q2b X y 25 68 50 20 75 36 100 -61 125 -104 (15 marks)