Something that got my attention is that they compare Annualized Failure Rate as-is, i.e. "whichever is higher". From statistics viewpoint, that sounds not quite

Something that got my attention is that they compare Annualized Failure Rate as-is, i.e. "whichever is higher". From statistics viewpoint, that sounds not quite right, because that number may happen just as a random fluke. Instead, every statistician would try to disprove the null-hypothesis with a predefined p-value. P-value is not a holy grail, but it's better than just comparing means.