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:
Supergroup
In the context of biology, a high-level taxonomic category above the level of kingdom, used to classify life in a broad scale; or, in other contexts, a term for a highly successful musical collaboration.
Archaeplastida
A major group of eukaryotic organisms that includes red algae, green algae, and land plants, characterized by the presence of plastids with chlorophyll.
Caffeine Consumption
the intake of caffeine, a stimulant drug found in various beverages and foods, which can affect the central nervous system.
Exam Performance
A measurement of how well a person performs on academic tests or examinations.
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