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p-value for negative x - TDIST formula

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    Question p-value for negative x - TDIST formula

    Hello everybody,

    I want to proof the hypothesis that a certain value is larger than zero (>0). And i am using a t-test and p-value ( =TDIST(ABS(t),df,1) )to test this hypothesis for multiple mean values. Some of the mean values are negative. How does it work with negative values?

    I have to use the ABS value, because it doesn't work with a negative value & the 1 means a one-tailed test.

    Can I just calculate the p-value of a negative t-statistics like this: 1 - TDIST(ABS(t),df,1)?


    Best

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    Re: p-value for negative x - TDIST formula

    What's wrong with

    =TDIST(a1,df,TRUE)

    Surely TDIST returns the left tailed T-distribution and the final term is either cumulative distribution or the probability density function.
    Glenn




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    Re: p-value for negative x - TDIST formula

    Hi,

    sorry i don't understand. What does TRUE instead of 1 for the one-tailed test mean?

    As far as I understand, i want the right tailed t-distribution if my hypothesis is >0.

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