A close friend of mine was doing her PhD in nutrition science (or something like this) and asked me to review her work from a math (especially statistics) aspec

A close friend of mine was doing her PhD in nutrition science (or something like this) and asked me to review her work from a math (especially statistics) aspect. I started to read it but it was so bad that I could not go on. I told her to get someone from her field because I am too traumatized to read that and if she takes my input into account she may well need to rewrite the whole thing. I was at her defense and some people asked questions about the statistical part, but the level was "how do you calculate the average". This worries me a bit because as far as the topic is concerned, statistical mistakes about Middle Ages in France are sad but that's it - but mistake sin nutrition or pharma can be worrisome. In her case that was quite esoteric so no risk for anyone but generally speaking I now do not trust any numbers I cannot analyze myself.