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Math Help - Z Score confusion

  1. #1
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    Z Score confusion

    How do u get the z score for 99.9%?

    How do you get the z score for the lowest 0.04%?

    i must be using the wrong table or something

    Please can someone help explain.
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  2. #2
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    Quote Originally Posted by ndcruz View Post
    How do u get the z score for 99.9%?

    How do you get the z score for the lowest 0.04%?

    i must be using the wrong table or something

    Please can someone help explain.
    (a) Pr(Z > z*) = 0.01 => Pr(Z < z*) = 0.99.

    (b) Pr(Z < -z*) = 0.04 => Pr(Z > z*) = 0.04 => Pr(Z < z*) = 0.96.

    Without knowing what Tables you use that's all that I can say.
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