Find a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2,where 
1 = .05,
11ec8feb_055f_e61c_bdf7_7733cc20d01e_TB2569_112 = .04,n1 = 500,and n2 = 2000.
Definitions:
Price Elasticity
A measure of how much the quantity demanded of a good responds to a change in the price of that good.
Labor
The human effort, including both physical and mental, used in the production of goods and services.
Excise Tax
A tax charged on specific goods and services, such as gasoline and alcohol.
Government Revenue
The total income received by the government from taxes, fees, fines, and other sources to finance public services and goods.
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