A study was recently conducted in which people were asked to indicate which new medium was their preferred choice for national news.The following data were observed: 
Given this data,if we wish to test whether the preferred news source is independent of age,the expected frequency in the cell,radio under 21 cell is 30.
Definitions:
Cap and Trade
An environmental policy tool that sets a limit (cap) on emissions and allows companies to trade (buy or sell) allowances that permit them to emit a certain amount of pollutants.
Tragedy of the Commons
A situation where individual users, acting independently according to their own self-interest, deplete or spoil shared resources, to the detriment of all users.
Sustainability
The practice of maintaining processes or states in a manner that prevents depletion of natural resources, ensuring long-term environmental balance.
Sustainability
The practice of maintaining processes or systems in a way that does not deplete natural resources or harm the environment, ensuring long-term ecological balance.
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