(c)(i) The Thiel-Nagar statistic is, for n = 15, k (including constant estimator) = 2 and d = 0.4148
 
        ^
        P = [n² (1 - d / 2) + k²] / (n² - k²)
           = [15²(1 - 0.4148 / 2) + 2²] / (15² + 2²)
           = 0.8251