This p-value calculator helps you to quickly and easily calculate the right-tailed, left-tailed, or two-tailed p-values for a given z-score. It also generates a normal curve and shades in the area that represents the p-value

What is a Z Score? A Z Score, also called as the Standard Score, is a measurement of how many standard deviations below or above the population mean a raw score is. Meaning in simple terms, it is Z Score that gives you an idea of a value’s relationship to the mean and how far from the mean a data point is.

Calculator to find out the z-score of a normal distribution, convert between z-score and probability, and find the probability between 2 z-scores.

Free Standard Normal Distribution Calculator - find the probability of Z using standard normal distribution step-by-step

Use this P to Z calculator to easily convert P-values to Z-scores (standard scores) and see if a result is statistically significant. Supports one-tailed and two-tailed p-values. Detailed information about what a Z-score is.

如果 P 值很小，说明原假设情况的发生的概率很小，而如果出现了，根据小概率原理，我们就有理由拒绝原假设， P 值越小，我们拒绝原假设的理由越充分。 总之， P 值越小，表明结果越显著。 但是检验的结果究竟是“显著的”、“中度显著的”还是“高度显著的”需要我们自己根据P值的大小和实际问题来解决。 Z 值代表随机变量经过列维-林德伯格中心极限定理的变形后，服从标准正态分布Φ（0,1），并且Z为该标准正态分布下的新变量。 在数量上表示该新变量为该标准正态分布下 …

Use this Z to P calculator to easily convert Z-scores to P-values (one or two-tailed) and see if a result is statistically significant. Z-score to percentile calculator (p-value from Z score) for both one-sided and two-sided p-values.

先看z≤0.54的p值，对照下图，首先看表格最左边那一列，找到0.5，然后，因为0.54的第二位小数是4，所以定位到顶行找到“4”那一列，得到0.7054；同样的方法，我们找到z≤-0.77对应的p值0.2206。

This p value calculator allows you to convert your Z-statistic into a p value and evaluate it for a given significance level. Simply enter your Z score (we have a Z score calculator if you need to solve for the Z-statistic) and hit calculate. It will generate the p-value for that Z-statistic.

2019年6月14日 · 统计学根据显著性检验方法所得到的p 值，一般以p < 0.05 为有统计学差异， p<0.01 为有显著统计学差异，p<0.001为有极其显著的统计学差异。 其含义是样本间的差异由抽样误差所致的概率小于0.05 、0.01、0.001。