Recent content by djwatson

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    Type II error textbook question

    Thanks Dason, i'll go with that!
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    Type II error textbook question

    So I thought that a type II error is the probability of accepting H0 when H0 is false, so from the critical region given, I'd accept H0 when x is within the critical region, so I dont understand why i'd want the probability of rejecting H0 if x <-1.5 or > 1.5, as i thought i'm explicitly looking...
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    Type II error textbook question

    Hi, I am currently teaching myself A level statistics from a textbook, which can be difficult when I can't work out how to get from the question to the answer given in the book, so here's hoping you can help! I keep thinking I've understood the process for type II errors, and then a question...
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    Distribution of Sample Proportion Question

    I did try doing it that way and ended up with the same answer. I also was taught in this book that because of the discrete/continuous you need to make continuity corrections which are + 0.5 on the top parameter and - 0.5 on the bottom parameter, so I thought trying it this way that P(X<3)...
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    Distribution of Sample Proportion Question

    Hi, apreciate any help anyone can give. I'm currently teaching myself A-level statistics from 'A Concise Course in A-Level Statistics' and I'm stuck on the below topic. In the following example, I followed it through and understood how the process worked (or so I thought!) I followed up to...
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    Combining normal variables homework question

    Thanks Kat, have got it now with your additional pointer, it was the combination of all ropes making it weaker that I had failed to consider. Appreciate your help :)
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    Combining normal variables homework question

    Hi all, First post on here, but would really appreciate any help anyone can give as I am stumped on the below question: The tensile strengths, measured in newtons (N), of a large number of ropes of equal length are independently and normally distributed such that 5% are under 706N and 5% over...