Some researchers have conjectured that stem-pitting disease in peach-tree seedlings might be controlled with weed and soil treatment.An experiment was conducted to compare peach-tree seedling growth with soil and weeds treated with one of two herbicides.In a field containing twelve seedlings,six were randomly selected throughout the field and assigned to receive Herbicide A.The remaining six were to receive Herbicide B.Soil and weeds for each seedling were treated with the appropriate herbicide,and at the end of the study period the height in centimeters was recorded for each seedling.The following results were obtained. 
Let W be the Wilcoxon rank sum test statistic equal to the sum of the ranks assigned to the Herbicide A group.Using the Normal approximation,what is the value of the two-sided P-value for the test?
Definitions:
Contrast Error
A type of appraisal or judgment bias where the evaluation of one person is unduly influenced by the comparison with another that has recently been appraised.
Problem-Solving Approach
A methodical process of identifying a problem, brainstorming solutions, and implementing the most effective resolution.
Feedback
Information provided regarding aspects of one’s performance or understanding, which can be used as a basis for improvement.
Halo Error
A bias in performance appraisals where an evaluator's overall impression of an individual, positive or negative, influences the assessment of specific traits or behaviors.
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