Use t-test to test hypothesis show steps.

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

Given

Delta Airlines

Year Gross Profits in Millions Other Revenue in Millions

2016 6353 3484

2017 5500 4052

2018 5151 4683

2019 6198 4730

Southwest Airlines

Year Gross Profits in Millions Other Revenue in Millions

2016 3450 1221

2017 3265 1383

2018 3164 1510

2019 2957 1652