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    (Original post by Saiyan)
    its not from a past paper lol... it was an example from my teacher...

    If I come across one in the pastpapers I will let you know
    June 2003 Q5 B).... don't be put off by the length of the question.. its quite simple... =)
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    Part ii is easy

    does continuity correction ring a bell?

    you know... when you go from a discrete prob to continuous

    P(X=22) would end up being
    19 20 21 22 23 24

    P(21.5<x<22.5)

    then you just standardise it
    and continue as 'normal'
    okeeeeee?
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    oh rightey! yh. thats kool! the equal thing got me, cos i thought you cant work out exact numbers as it a continuous, but yh, ill remeber that. thanx! (that's from the Jan 05 papaer btw)

    and yh, i just did that june 2003 apaper yesterday! i wish it had just got to the point, because i went off into all directions except that one! But reading it back over, it makes sense. its very much like finding a type I error right?

    In the same paper, june 03, question 6 ii) b, do you know how to work out expected value of s.
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    (Original post by Tazzie)
    oh rightey! yh. thats kool! the equal thing got me, cos i thought you cant work out exact numbers as it a continuous, but yh, ill remeber that. thanx! (that's from the Jan 05 papaer btw)

    and yh, i just did that june 2003 apaper yesterday! i wish it had just got to the point, because i went off into all directions except that one! But reading it back over, it makes sense. its very much like finding a type I error right?

    In the same paper, june 03, question 6 ii) b, do you know how to work out expected value of s.
    Yup!! ∑xp remember that from discrete probability !? lol use that and it should work

    Do you know how to do Q4 ii) on that same paper ! ? lol :eek:
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    (Original post by Saiyan)
    Yup!! ∑xp remember that from discrete probability !? lol use that and it should work

    Do you know how to do Q4 ii) on that same paper ! ? lol :eek:
    yay, lol, i can do that one. luks like the only one!

    find P(x=0), by subbing 0 into the poisson equation. so you get

    e>0.2
    -λ>ln0.2
    λ>1.609 /3x60

    =32.2seconds.
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    or you can do question 4, suing the table method. look up 0.2 ont the table at X=0, should give you 1.60 the n X20
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    (Original post by Tazzie)
    or you can do question 4, suing the table method. look up 0.2 ont the table at X=0, should give you 1.60 the n X20

    No dont do it this way, you cant! It has to be to 1 decimal place therefore you need to use the formula!
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    !! hehe.. thanks alot you two =)
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    yh, thats what i thought. the mark scheme allows both ways though.
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    hey how did you get this part ? - why did u divide by (3*60) λ>1.609 /3x60
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    as you have λ=1.60

    they have given λ=3 per minute. divide by 3, to get your λ in minutes. then *60, to get it i nseconds.
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    (Original post by Tazzie)
    as you have λ=1.60

    they have given λ=3 per minute. divide by 3, to get your λ per 1 minute. then *60, to get it i nseconds.
    ahhh right. Thanks ! *happy
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    (Original post by Saiyan)
    ahhh right. Thanks ! *happy
    ive edited yh, its to find u're lamda in minutes, not per minute, because lamda per minute is 3.

    i think that makes sense.
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    (Original post by Tazzie)
    ive edited yh, its to find u're lamda in minutes, not per minute, because lamda per minute is 3.

    i think that makes sense.
    oh right yup.. I see...
    'because lamda per minute is 3.' divide by 3 to get it per 1 minute then..multiply it by 60 to get the seconds.. Thanks Again
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    Omg.. have you seen Q6 part ii) on January 2005!!.. It looks so confusing.. Make sure you've attempted it... i`m attempting it again..!

    Edit:
    I`m stuck how to do it ?
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    (Original post by Saiyan)
    Omg.. have you seen Q6 part ii) on January 2005!!.. It looks so confusing.. Make sure you've attempted it... i`m attempting it again..!

    Edit:
    I`m stuck how to do it ?

    hey can you somehow show me the jan 2005 paper. My school didnt have it. Damn im missing vital practise.

    Ill help you do it!!
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    hey. If anyone has answers for jan05 n the paper, would be so much appreciated if i could have a copy of it. I took the exam in jan as a resit, n went down to an e, oops, so decidied to stick with the original mark. Also if anybody has anything at all on s4, could u please please please let me know. thanks
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    (Original post by HollyJa)
    hey. If anyone has answers for jan05 n the paper, would be so much appreciated if i could have a copy of it. I took the exam in jan as a resit, n went down to an e, oops, so decidied to stick with the original mark. Also if anybody has anything at all on s4, could u please please please let me know. thanks
    Statistics 2 - January 2005 - Answers


    1 (i) 0.143;
    (ii) 0.785.

    2 (i) Those with strong feelings more likely to respond; only readers of the
    paper will respond;
    (ii) Give each member of the population a number; select a sample using
    random number tables; contact those selected.

    3 (i) μ = 63.1, σ = 10.3;
    (ii) Not a symmetrical distribution.

    4 ; accept - poll result consistent with claim
    (X > 9 accept , X ≤ 9 reject ).

    5 (i) 0.0769;
    (ii) 0.0808;
    (iii) 5.06%.

    6 (i) Rejection of null hypothesis when it is true;
    (ii) 0.117;
    (iii) Yes – required by the binomial distribution.

    7 (i) 1;
    (ii) Total area under curve must be 1 – curve is above line for larger x and
    therefore below line for smaller x;
    (iii) Model 2 value is greater than q.

    8 (i) N ;
    (ii) Reject - evidence that mean path length is less than 42 cm (critical
    value is 37.4 cm);
    (iii) Decreased probability of rejecting - scientists more cautious about
    accepting particles as ocrons.

    there you go
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    (Original post by confused?)
    hey can you somehow show me the jan 2005 paper. My school didnt have it. Damn im missing vital practise.

    Ill help you do it!!
    lol hold on.. let me see if I can scan it..
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    do you have an email address hollayJA/confused??
 
 
 
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