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    I've got the same issue! I hope to god they were looking for only sigma
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    For the doctor question, did you all reject H0? I got mean 11.76, variance 18 (unbiased estimator) and a z value of 1.92 or something like that
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    (Original post by rich1334)
    It asked for u and sigma
    So the answers were:

    u=146 and sigma=2, right?
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    (Original post by rich1334)
    For the doctor question, did you all reject H0? I got mean 11.76, variance 18 (unbiased estimator) and a z value of 1.92 or something like that
    Yup, I got that too
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    (Original post by Molly_xox)
    So the answers were:

    u=146 and sigma=2, right?

    I recognise 146 so yeah I think so!
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    (Original post by Molly_xox)
    So the answers were:

    u=146 and sigma=2, right?
    yep i edited my post saying Var=4, hope i didnt worry too many people i just forgot what the question was
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    (Original post by tokopoko)
    yep i edited my post saying Var=4, hope i didnt worry too many people i just forgot what the question was
    Haha, no worries, it just would've been frustrating if we'd lost such a stupid mark
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    What did everyone get as the value for a for each part of the questions? I got a=6 for both....
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    I stored all my answers in my calculator and here they are (I think 8ii is wrong):
    1. Mean = 146, sigma = 2
    2. i) The rabbits occur independent of each other
    ii) 0.222 (Using poisson)
    3. i) a = 6
    ii) a = 1.5
    4. 0.8311
    5. 0.2536
    6. 0.9807
    7. i) 0.1247
    ii) 38
    8. i) 0.0316
    ii) 0.961 (I did 1 - (1/3((1-0.9685)+(1-0.6047)+(1-0.0933)))^4)
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    What did everyone get for 7ii)? Most people I've talked to either put 37 or 38.
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    (Original post by AMDD)
    What did everyone get as the value for a for each part of the questions? I got a=6 for both....
    a=6 for first part

    i got a=1.5 for the second part (may be wrong though)
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    (Original post by TingA)
    What did everyone get for 7ii)? Most people I've talked to either put 37 or 38.
    38
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    (Original post by thickmaster)
    I stored all my answers in my calculator and here they are (I think 8ii is wrong):
    1. Mean = 146, sigma = 2
    2. i) The rabbits occur independent of each other
    ii) 0.222 (Using poisson)
    3. i) a = 6
    ii) a = 1.5
    4. 0.8311
    5. 0.2536
    6. 0.9807
    7. i) 0.1247
    ii) 38
    8. i) 0.0316
    ii) 0.961 (I did 1 - (1/3((1-0.9685)+(1-0.6047)+(1-0.0933)))^4)
    looks good from what i remember. 8ii) is wrong i think but you got method marks for using 0.6047 and 0.0933
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    (Original post by TingA)
    What did everyone get for 7ii)? Most people I've talked to either put 37 or 38.
    It's 38, I didn't know which way to round so I carried out the test on 37, 38 and 39 and 39 is the first one you do not reject.
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    (Original post by TingA)
    What did everyone get for 7ii)? Most people I've talked to either put 37 or 38.
    (Original post by tokopoko)
    38
    I got 37, you need to round down. I remember testing the different values and 38 didn't fall in the critical region
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    I did the test for 38 and got that you do not reject it. Did you remember continuity correction?
    (Original post by Molly_xox)
    It's 38, I didn't know which way to round so I carried out the test on 37, 38 and 39 and 39 is the first one you do not reject.
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    What do you think the grade boundary will be this year?
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    (Original post by Molly_xox)
    It's 38, I didn't know which way to round so I carried out the test on 37, 38 and 39 and 39 is the first one you do not reject.
    Did you apply a continuity correction?
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    (Original post by rich1334)
    I got 37, you need to round down. I remember testing the different values and 38 didn't fall in the critical region
    my critical region was about X<38.3. did you use a normal dist? so the biggest number in this region is 38
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    (Original post by rich1334)
    I did the test for 38 and got that you do not reject it. Did you remember continuity correction?
    Yeah, +0.5...

    38-50/sq rt(50) = -1.697, and I thought you needed to compare it to -1.645?
 
 
 
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