Natural Gas Burns with a Relatively Clean Flame

question 90

Multiple Choice

Natural gas burns with a relatively clean flame.Which of the following potential pollutants is produced in significant quantities during the combustion of natural gas in air?

• A)sulfur oxides
• B)nitrogen oxides
• C)metal oxides
• D)All of the above are produced in significant quantities.

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Definitions:

Correlation Studies

Research methods that examine the relationship or association between two or more variables, without determining causation.

Random Assignment

The process of allocating participants in an experiment to different groups in a way that each participant has an equal chance of being assigned to any group, helping to ensure the validity of the results.

Causation

is the action of causing something, referring to a relationship between two events where one event (the cause) is understood to directly result in the other event (the effect).

Third-variable Problem

A situation in correlation studies where a variable that has not been measured accounts for the relationship between two other variables, potentially misleading the results.