we've learned about several tests for the difference of two means, which allow us to compare two averages.

First, carry out a hypothesis test for the difference of the average flight arrival delay between Alaska Airlines (AS) and Southewest Airlines (WN).

\ft-Test: Two-Sample Assuming Equal Variances AS WN Mean -9.6923077 -8.75 Variance 197.797571 227.231481 Observations 39 28 Pooled Variance 210.023964 Hypothesized Mean Difference 0 df 65 t Stat -0.2625018 P(T