P-value to Z-score Calculator. 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.
Z-score to P-value Calculator - calculates P from Z (Z to P).
The z-Table. by M. Bourne. The z-Table on this page indicates the area to the right of the vertical center-line of the z-curve (or standard normal curve) for different standard deviations. This table is very useful for finding probabilities when the event in question follows a normal distribution. Example.How To Find Critical Values of Z. This calculator is intended to replace the use of a Z value table while providing access to a wider range of possible values for you to work with. In the offline version, you use a z score table (aka a z table) to look up the critical value for the test based on your desired level of alpha.The p-value was introduced by Karl Pearson in the Pearson's chi-squared test, where he defined P (original notation) as the probability that the statistic would be at or above a given level.This is a one-tailed definition, and the chi-squared distribution is asymmetric, only assuming positive or zero values, and has only one tail, the upper one.
Our approximate P-Value is then the P value at the top of the table aligned with your column. For our test the score is very much high than the highest value in the given table of 10.827. So we can assume that P-Value for our test is less than 0.001 at least. If we run our score through GraphPad, we will see it’s value is about less than 0.00001.The corresponding area is 0.8621 which translates into 86.21%. On some z-tables you will find that the area corresponding to 1.09 z-score is 0.3621. Don’t be confused. Such tables just show the area to the right and the left of the mean. This means that for positive values you need to add 0.5 (i.e. 50%) to calculate the area to the left of a.
