is about is_specified_output_of quantitative confidence value statistical test hypothesis null hypothesis p-value for one-sided test 1 Brian S. Alper A p-value which represents the probability of obtaining a result at least as far, in one direction, from the value actually obtained as the value expected, assuming the null hypothesis is true. COKA/SEVCO group Harold Lehmann Kenneth Wilkins P-value is defined as a hypothesis testing measure that represents the probability of obtaining a result at least as far from the value actually obtained as the value expected, assuming the null hypothesis is true. A p-value for one-sided test interprets 'at least as far from' with either the direction of 'greater than' or the direction of 'less than' but not with both possible directions. Philippe Rocca-Serra one-sided test p-value one-tailed test p-value ready for release