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:
Microsystem
In ecological systems theory, this term refers to the immediate environments with which an individual interacts, such as family, school, and workplace.
Critical Period
A specific time frame in the early stages of an organism's life during which it is particularly sensitive to certain environmental stimuli that are essential for proper development.
Human Fetus
A developing human from the end of the embryonic period, approximately nine weeks after fertilization, until birth.
Sensitive Period
A critical phase in early development where the individual is particularly receptive to certain stimuli and capable of acquiring specific skills or knowledge.
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