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Consider the following data showing mean annual air pollution levels (units ppm) from 2015 and 2018 at te n Canadian weather sta tions: Researchers are
Consider the following data showing mean annual air pollution levels (units ppm) from
2015 and 2018 at ten Canadian weather stations:
Researchers are interested in whether mean annual air pollution levels across Canada have increased between 2015 and 2018. Using the data in the table above, perform an appropriate statistical hypothesis test at the 5% significance level to answer this question.
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