Question: I am working on a statistical research paper comparing the US domestic flight delay rate before and during Covid 19. I am wondering what three

I am working on a statistical research paper comparing the US domestic flight delay rate before and during Covid 19. I am wondering what three of parametric statistical test (Hypothesis Testing, Population Confidence Interval, ANOVA and Regression) should I use, also which non-parametric statistical test should I use. Thank you.

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