How and When Are Nitrogen Oxide (NO_X) Emissions Formed in the Internal

question 14

Essay

How and when are nitrogen oxide (NO_X) emissions formed in the internal combustion engine?

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Definitions:

Categorical Variable

A type of variable that can take on one of a limited, and usually fixed, number of possible values, representing distinct categories or groups.

Response Variable

The outcome variable of interest in a study or experiment, which is hypothesized to depend on one or more independent variables.

Boxplot

A graphical representation used in statistics to show the distribution of numerical data and highlight the mean, median, quartiles, and outliers.

Influential Points

Data points that have a disproportionately large effect on the results of a statistical analysis, potentially skewing the analysis.