A medical researcher wondered if there is a significant difference between the mean birth weight of boy and girl babies.A random sample of babies' weights (pounds) showed the following: 
How many degrees of freedom would be used to test for a zero difference in means?
Definitions:
Autarky Price
The price of a good in a country without international trade, determined solely by domestic supply and demand.
International Trade
The trade of products and services across the borders of different countries or territories.
Consumer Surplus
The difference between the total amount that consumers are willing and able to pay for a good or service versus the total amount that they actually pay.
Producer Surplus
The gap between the price producers are willing to accept for offering a good or service and the actual price they receive.
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