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    • Thread Starter

    7. A teacher thinks that 20% of the pupils in a school read the Deano comic regularly.
    He chooses 20 pupils at random and finds 9 of them read the Deano.
    (a) (i) Test, at the 5% level of significance, whether or not there is evidence that the
    percentage of pupils that read the Deano is different from 20%. State your
    hypotheses clearly.
    (ii) State all the possible numbers of pupils that read the Deano from a sample of size 20
    that will make the test in part (a)(i) significant at the 5% level.
    For part ii, i made two equations as i thought it was a two tailed test.
    I did p(x<=1-c)=>0.975 and p(x<=c)<=0.025
    my answers were wrong. Can someone tell me where i went wrong and the correct steps?

    (Original post by MIKE ESSIEN IS QUITE SICK)
    Post more of your working and I'll look for flaws.
    • Thread Starter

    (Original post by Clarity Incognito)
    Post more of your working and I'll look for flaws.
    i found out that in the markscheme they didnt treat it as two tail but the question is implying that we should find if probabiltiy is DIFFERANT(which i thought would mean two tail).
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Updated: January 18, 2010
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