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Math Help - normal distribution to approximate

  1. #1
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    normal distribution to approximate

    How do I find P(Z \le -0.9)? I think it is the same as P(Z \ge 0.9). So then, do I just find \Phi0.9 and subtract it from 1? (1-0.8159=0.1841)
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  2. #2
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  3. #3
    MHF Contributor matheagle's Avatar
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    I really like these online stat calculators.
    They give p-values and they have all kinds of densities, t, F...
    Free Cumulative Area Under the Standard Normal Curve Calculator
    Plugging in -.9 give a probability of .1840601 and you can see a pretty picture too.
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  4. #4
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    Thank you so much! That calculator definitely will come in handy.
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  5. #5
    MHF Contributor matheagle's Avatar
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    Notice that there are many different distributions on the home page.
    Also when you learn about p-values you will look back and really appreciate my comments today.
    Last edited by matheagle; June 1st 2009 at 11:17 PM.
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