One-tailed or two-tailed? - Statistical Modeling, Causal Inference. You may know all the stats in the world, but if the wrong conclusion is wrong you could make a multi million error. Null Hypothesis = Assumption that the experimental results are due to chance alone; nothing (from 6M) influenced our results Alternate Hypothesis = We expect to find certain outcome Snificant results = When the experimental results are not likely to occurred by chance Example #1 : Has cycle time of my transaction has changed from year 1 to year 2 H0 = Average of Year 1 = Average of Year 2 ; No change occurred; any change is due to chance alone Ha = Average of Year 1 NOT = Average of Year 2. I would say the 2-tailed p-value is more standard but some people will. to data as strong evidence in favor of a specific alternative hypothesis.
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Scientific method Statistical errors Nature One probable reason for this overuse of two-tailed testing is the seemingly valid beliefs that two-tailed testing is more conservative and safer than one-tailed testing. P values, the 'gold standard' of statistical validity, are not as reliable as many scientists assume.
Two-Tailed Test Definition Investopedia However, the authors examine the legitimacy of this notion and find it to be flawed. What is a 'Two-Tailed Test' A two-tailed test is a statistical test in which the critical area of a distribution is two-sided and tests whether a sample is greater.