#UC22331

H0: The higher the MCO version upgrade, MCO will be much stricter and better, and lockdown means u really can’t go anywhere.

H1: The higher the MCO version upgrade, MCO will be much looser and worse, and lockdown means nothing.

Conclusion: Reject H0 as evidence shows that in terms of performance, MCO 3 < MCO 2 < MCO 1. Thus, do not upgrade MCO as it is best to apply the original version of itself.