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    (Original post by ServantOfMorgoth)
    Lol I can never get full marks in anything, I make too many mistakes.

    At levels I had 100 UMS knowledge but I'd never actually get it. It's always 97, 95 lol so annoying.

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    Same, I have not come anywhere close to 100 rest assured.

    :console: 97 or 95 is still pretty impressive though :borat:
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    Anyone with the S3 edexcel book, can you explain Q5 Ex 2A. It has been driving me nuts for about 45 minutes wondering where in the table the numbers are coming from in the solutions in Part b and c.
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    (Original post by physicsmaths)
    Anyone with the S3 edexcel book, can you explain Q5 Ex 2A. It has been driving me nuts for about 45 minutes wondering where in the table the numbers are coming from in the solutions in Part b and c.
    Name:  ImageUploadedByStudent Room1461790555.837622.jpg
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Size:  141.1 KB


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    That is the question I was referring to when I said 'the textbook questions are rubbish ' it is not clear at all how they got those numbers in the answers. So just make sure you know the method and one way of doing it and you should be fine.
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    (Original post by physicsmaths)
    Did u lot actually learn ch 2?


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    Nope. I'll spam it night before the exam and hope for the best.
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    (Original post by Zacken)
    Nope. I'll spam it night before the exam and hope for the best.
    dang you're brave
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    (Original post by Zacken)
    We're not all as dumb as you.
    Come on man that was uncalled for
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    (Original post by physicsmaths)
    Well your retarded, mentally and probably physically.
    Your mum says hello from my house.


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    LOOOOOOOOOL

    Banter with you is always A1 omg
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    (Original post by physicsmaths)
    Well your retarded, mentally and probably physically.
    Your mum says hello from my house.


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    oh btw I tutored your sister last night

    and I showed her the growth of my natural log yesterday
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    (Original post by DuckNotGooseG)
    oh btw I tutored your sister last night

    and I showed her the growth of my natural log yesterday
    Took you 6 mins to think of that.
    Growth of natural log, that is all you say.
    You should grow your natural log, its current ln(0) -infinity.


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    (Original post by Zacken)
    We're not all as dumb as you.
    Wtf???

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    (Original post by DuckNotGooseG)
    ...
    Righto.. back to the topic at hand, I think.
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    For June 2015 question 1c, can't H1 (alt hypotheses) be p<0 as the claim is higher book pages the lesser the borrows?
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    (Original post by Rkai01)
    For June 2015 question 1c, can't H1 (alt hypotheses) be p<0 as the claim is higher book pages the lesser the borrows?
    Yes, but they're concerned with ranks. Notice that the higher the (number of) rank, the greater the number of pages.
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    When working with Confidence intervals of random percentages, how do you get exact values of z? I only get them upto 2dp.


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    (Original post by physicsmaths)
    When working with Confidence intervals of random percentages, how do you get exact values of z? I only get them upto 2dp.


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    Percentage point tables under the normal distribution table. Page 21 of the PDF using acrobat/chrome or page 19 on the actual PDF of the formula booklet.
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    (Original post by physicsmaths)
    When working with Confidence intervals of random percentages, how do you get exact values of z? I only get them upto 2dp.


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    Check the formula booklet/textbook, there is a table with values to 4 d.p for some values like 2.5%, 5%, 0.01% etc.
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    PRSOM guys, cheers forgot about those tables!
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    Hey SeanFM, could you please explain the difference between quota and stratified sampling? I'm struggling to see differences, but what I make of it is that in quota sampling you just know the proportions/percentages of each type of member that goes into a sample, and in stratified sampling you divide the population into strata and THEN apply systematic sampling. Confused about this.
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    (Original post by Ayman!)
    Hey SeanFM, could you please explain the difference between quota and stratified sampling? I'm struggling to see differences, but what I make of it is that in quota sampling you just know the proportions/percentages of each type of member that goes into a sample, and in stratified sampling you divide the population into strata and THEN apply systematic sampling. Confused about this.
    You're right, they seem almost identical I'm looking at this page and it doesn't seem to be clear. In quota sampling they seem to get an interviewer and interview a number of people until they have enough of that group, and may do some more interviews but won't count then. It seems a bit weird


    The obvious disadvantage is that quota involves an interviewer so a disadvantage is that it can introduce interviewer bias
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    (Original post by SeanFM)
    You're right, they seem almost identical I'm looking at this page and it doesn't seem to be clear. In quota sampling they seem to get an interviewer and interview a number of people until they have enough of that group, and may do some more interviews but won't count then. It seems a bit weird


    The obvious disadvantage is that quota involves an interviewer so a disadvantage is that it can introduce interviewer bias
    I think I sorta figured it out. Quota is completely random in who it interviews (no random numbering or such) while stratified is systematic. Thank you.
 
 
 
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