The following are the ratings (0 to 4) given by 12 individuals for two possible new flavors of soft drinks. 
Wilcoxon rank-sum is to be used. What is the z-test statistic?
Definitions:
Organic Product
An organic product is a chemical substance or material produced as a result of organic chemistry, primarily involving carbon-based compounds.
Synthetic Steps
The individual reactions that occur in sequence during the synthesis of a compound.
Methylpropane
An alternative name for isobutane, a branched-chain hydrocarbon with the formula C4H10, found in natural gas and used as a refrigerant and a propellant.
Hydride Shift
A rearrangement reaction where a hydrogen atom, together with its bonding electrons, moves from one carbon to another within a carbon skeleton.
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