Ten stores were selected to test the effects of two different designs for packaging a tablet on sale. Five stores were randomly assigned to design 1 and the other five stores were assigned to design 2. The data below provide the sales over a one-week period. 
The standard deviation of the Wilcoxon Rank Sum test is:
Definitions:
Ethical Standards
Guidelines or principles designed to govern behavior and conduct, particularly in professional settings, to ensure fairness, integrity, and respect.
Legal Standards
Established principles and criteria in law that guide judicial rulings and the enforcement of laws.
Army Alpha
Test that measured the verbal ability, numerical ability, ability to follow directions, and knowledge of information of military recruits.
Army Beta
Nonverbal counterpart to the Army Alpha that was used to evaluate the aptitude of illiterate, unschooled, or non-English-speaking recruits.
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