If you want the p-value for the other tail of the distribution, just subtract it from 1. Since the normal distribution is symmetrical, it does not matter if you are computing a left-tailed or right-tailed p-value: just select one-tailed and you will get the correct result for the direction in which the observed effect is. If the direction of the effect does not matter, select two-tailed, which corresponds to a point null hypothesis. If you want to make directional inferences (say something about the direction or sign of the effect), select one-tailed, which corresponds to a one-sided composite null hypothesis. Just enter the Z-score that you know and choose the type of significance test: one-tailed or two-tailed to calculate the corresponding p-value using the normal CPDF (cumulative probability density function of the normal distribution). If you obtained a Z-score statistic from a given set of data and want to convert it to its corresponding p-value (percentile), this Z to P calculator is right for you. How to interpret a low p-value (statistically significant result).Using the z-score to p-value calculator.
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