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jellybaby
I’m also not brilliant at stats but I’m not sure this is something where “significance” testing would apply as there is no (or very little) uncertainty in the numbers. These aren’t sample means used to estimate the true population figure - they’re hard numbers for the whole population, on a measure (death) which is traditionally hard to miss for recording purposes, so it’s either higher or it isn’t.
Whether the rise is significant in terms of its impact on society/the economy etc is obviously a different question.