1 A set of bivariate data (X, Y) is summarised as follows. n = 25, Ex =9.975, Ey =11.175, Ex? =5.725, Ey? = 46.200, Exy = 11.575 (a) Calculate the value of Pearson's product-moment correlation coefficient. (b) Calculate the equation of the regression line of y on x. [2] It is desired to know whether the regression line of y on x will provide a reliable estimate of y when x = 0.75. (c) State one reason for believing that the estimate will be reliable. [1] (d) State what further information is needed in order to determine whether the estimate is reliable. ]