A horse trainer teaches horses to jump by using two methods of instruction. Horses being taught by method A have a lead horse that accompanies each jump. Horses being taught by method B have no lead horse. The table shows the number of training sessions required before each horse performed the jumps properly.

Use a rank-sum test with a 5% level of significance to test the claim that there is no difference between the training sessions distributions. Compute the sample test statistic, R, the rank-sum.

a. 137

b. 135

c. 139

d. 122

e. 136

PLEASE SEE ATTACHED

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