The standard error of the sampling distribution of a sample proportion is 
where p is the sample proportion.
Definitions:
Equilibrium Quantity
The amount of products or services available that matches the amount consumers are willing to buy at the equilibrium price in the market.
Equilibrium Point
Point at which quantity demanded equals quantity supplied; where demand and supply curves cross.
Equilibrium Price
The cost at which the amount of a product supplied matches the amount of the product desired.
Equilibrium Quantity
The supply of goods or services meets the demand at the market's equilibrium price.
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