## ABX P Value

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Reply #1 –

I don't know if there's an easier mathematical equation for it, but this one works:

n=number of trials

k=number correct

q=temp variable

sum( q=0 to n-k : ([span style='font-size:8pt;line-height:100%']n[/span]C[span style='font-size:8pt;line-height:100%']q[/span]) / (2^n))

For n=5 and k=4, this gives 1/32 + 5/32 = 3/16 ~ 0.1875

[edit: deleted quote]