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Thread: Help in statistics for my exams with z calculations

  1. #1
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    Question Help in statistics for my exams with z calculations

    Hi guys,nice to meet you,its my first time here(Sry for my english) !!

    In some days i will be examed on statistic 2 and i have problem with the following problems :

    My teacher says to answer if the following problems are true or false and to explain why(to prove it with calculations)

    • 2 *z 0.035 = z 0.070
    • z 0.05 >z 0.07
    • z0.035 > t32 0.035
    • z0.035 = 0.5*Z0.070


    How i solve them ?
    Thank you.
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  2. #2
    MHF Contributor

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    Re: Help in statistics for my exams with z calculations

    Do you not know what the "z- statistic" is? It would be very strange for your teacher to give you problems like this if you don't. It would be strange for you to be in "Statistics 2" but not have learned that in "Statistics 1".

    The z-statistic is the statistic (variable) in the standard normal distribution. You cannot calculate z_{0.070} (there is a formula but it involves an integral that does not have an elementary "anti-derivative), you need to look it up in a table or some calculators (those designed for statistics work) gave a "z-statistic" key. Your text book probably has a table but Wikipedia has one, together with a discussion of how to use it, here:
    https://en.wikipedia.org/wiki/Standard_normal_table
    Last edited by HallsofIvy; Sep 3rd 2017 at 10:58 AM.
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