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Which of the following is not a restriction for comparing two population means?
Troposphere
The lowest layer of Earth's atmosphere, where weather occurs and where most atmospheric water vapor exists.
Greenhouse Gases
Gases in Earth's atmosphere, such as carbon dioxide and methane, that trap heat, leading to a warming effect known as the greenhouse effect.
Fossil Fuels
Natural fuels such as coal, oil, and natural gas, formed from the decomposed remains of plants and animals over millions of years.
CFCs
Chlorofluorocarbons, chemical compounds once commonly used in refrigerants and aerosol sprays that contribute to ozone layer depletion.
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