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(c) Twelve pairs of twin male lambs were selected: diet plan I was given to one twin and diet plan II to the other twin in each case. The weights of the twelve pairs of twin make lambs at eight months were as follows. Diet I 111 102 90 110 108 125 99 121 133 115 90 101 Diet II 97 90 96 95 110 107 85 104 119 98 97 104 (i) Use the sign test to test the hypothesis that there is no difference in the diets against the alternative that diet I is preferable to diet II at 10% level of significance. (4 marks) (ii) Repeat part (c)(i) using the Wilcoxon paired-sample signed-rank test. (3 marks) (iii) State whether you obtain the same conclusions from part (c)(i) and (c)(ii). Justify your answer. (2 marks)