Attitude Test Narrative
Twenty students are given an attitude test before and after viewing a motion picture designed to change their attitudes favourably toward a new curriculum. A high score indicates a favourable attitude and a low score indicates an unfavourable attitude, with the scores ranging from 1 to 30. This will use the sign test on the data given below to see if we can conclude the motion picture was successful in improving attitudes. 
-Refer to Attitude Test Narrative. Describe what the test statistic is for the Wilcoxon signed-rank test. What is the value of the test statistic in this ?
Definitions:
Elasticity of Demand
A measure of how much the quantity demanded of a good responds to a change in the price of that good, with all other things being equal.
Price Ceiling
A government-imposed limit on how high a price can be charged for a product or service, typically set below the market equilibrium price.
Shortage/Surplus
A market condition where the quantity of a good supplied is not equal to the quantity demanded, with a shortage being a deficit and a surplus being an excess.
Minimum Wage
The lowest legal hourly pay rate that employers can pay to workers.
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