What statistical method can be applied for this study? Explain your answer b. What is the hypothesis of the study? c. At a 10% significance level, is the performance between the two sample groups
Based on the data of air pollution in Los Angeles in 2019, the Environmental Protection Agency (EPA) decided to publish a new stricter regulation effective in January 2020 to reduce hydrocarbon pollution. EPA wants to evaluate whether the new regulation makes significant differences in reducing
pollution. EPA collects data of monthly hydrocarbon pollution level as follows:
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2019 7.3 6.0 5.4 5.9 3.9 5.7 6.9 7.6 6.3 5.8 5.1 5.9
2020 5.3 6.1 5.6 5.7 3.7 4.7 6.1 7.2 6.4 5.7 4.9 5.8
a. What statistical method can be applied for this study? Explain your answer
b. What is the hypothesis of the study?
c. At a 10% significance level, is the performance between the two sample groups significantly different?
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