Please determine what non-parametric test to use to test this hypothesis and test hypothesis. I originally used t-tests, so I am unsure which test to use now.

Hypothesis 2:Other revenues show a positive relationship with gross profits for Delta Airlines.

Use t-test to test hypothesis show steps.

1. There are statistically significant differences in other revenues and profitability of Delta vs Southwest Airlines from 2016 to 2020.

Given

Delta Airlines

Year Gross Profits in Millions Other Revenue in Millions

2016 6353 3484

2017 5500 4052

2018 5151 4683

2019 6198 4730

2020 -15495 4212

Southwest Airlines

Year Gross Profits in Millions Other Revenue in Millions

2016 3450 1221

2017 3265 1383

2018 3164 1510

2019 2957 1652

2020 -4256 1383

What are the identified mistakes?