Finding p-value when df and test stat is given. PLEASE HELP.

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For a chi-square goodness of fit test with 10 degrees of freedom, the test stat is 20.000, then how to find the p-value? In other words, what is ?: X^2?,10 = 20.000?

The X^2 table does not give the exact value of 20.000 when I look under 10 df.

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R gives the following value

> pchisq(q=20, df=10, lower.tail=FALSE)
[1] 0.02925269

You might want to compare this with the values you do have in you $\chi^2$ table to see if it is plausible.