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Thread: one or two tailed?

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    one or two tailed?




    Ok, so i know when testing to determine if say a drug umproves some fuction, the null and alternate hypothesis would not be two tailed. But, if im not sure which signs to use, < or > when setting up my null and alternate hypothesis for this one problem i am setting up to solve for.
    The question asks what my null and alternate hypothesis would be if i was to determine whether test subjects with a new treatment have a longer life span than that of the mean life span. Would this be set up null < #, and alternate >#, meaning i would have a one tailed upper critical?
    Thanks=)

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    Quote Originally Posted by acarnle1 View Post
    The question asks what my null and alternate hypothesis would be if i was to determine whether test subjects with a new treatment have a longer life span than that of the mean life span. Would this be set up null < #, and alternate >#, meaning i would have a one tailed upper critical?
    Thanks=)
    The effective null hypothesis is null = #
    alternate >#

    check this also
    http://en.wikipedia.org/wiki/Null_hypothesis & see the Directionality part
    In the long run, we're all dead.

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