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Struggling with Statistics 2 OCR

Hi, I'm doing S2 OCR and I understand the probability distributions and CRV's etc but I just don't seem to fully understand topics like sampling, hypothesis testing and errors. On exam solutions there weren't many videos on these for OCR. I go halfway through an exam question and genuinely don't know what to do or sometimes I don't even get the questions themselves. Can anyone suggest how I can overcome this? Are there any good resources you'd recommend? Thanks!

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