Even Though the Concentration of Air Pollution Has Gone Down

question 1

True/False

Even though the concentration of air pollution has gone down over time,people in some metropolitan areas still breath are that contains unhealthy levels of pollutants.

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Definitions:

Chi-square Test

A statistical test used to determine if there is a significant difference between the expected frequencies and the observed frequencies in one or more categories.

Distribution

Refers to the way in which something is shared out or spread across a range, often used in reference to statistical data.

Two Variables

Refers to studies or analyses that involve examining the relationships or interactions between two different variables.

Test of Independence

A statistical technique that identifies whether there is a meaningful relationship between two variables of categorical type.