What is the formula to calculate a p-value by hand from the results of a t-test?  For example: Two Sample t-test data: x and y t = -18.509, df = 10, p-value = 1 alternative hypothesis: true difference in means is greater than 0 95 percent confidence interval: -233.4911 Inf sample estimates: mean of x mean of y 165.8333 378.5000

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