Examlex
The Department of Education wishes to estimate average SAT score among U.S.high school students.How many students would they have to sample,given that the test has a known population standard deviation of 100,in order to ensure that the margin of error was no more than 20 for a 99% confidence interval?
Atmosphere
The layer of gases surrounding a planet or other celestial body, held in place by gravity.
Earth
The third planet from the Sun, uniquely characterized by its vast oceans, breathable atmosphere, and diverse ecosystems supporting life.
Photochemical Smog
A type of air pollution created when sunlight reacts with nitrogen oxides and at least one volatile organic compound in the atmosphere.
Volatile Organic Compounds
Organic chemicals that have a high vapor pressure at ordinary room temperature, making them significantly evaporative and potentially harmful to the environment and human health.
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