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How to Calculate P-Value.
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How to Calculate P-Value.

Rosemary Njeri

In statistics, the p-value is the probability of obtaining results at least as extreme as the observed results of a statistical hypothesis test, assuming that the null hypothesis is correct.

P-value helps you determine the significance of your results in relation to the null hypothesis.

Formula to calculate p-value.

  • We need to find out the test statistic z using the following diagram.
How to Calculate P-Value.
How to Calculate P-Value.
  • Then find the corresponding level of p from the z value obtained from the z tables which can be found online.
How to Calculate P-Value.

Example:

Suppose you calculated your z value and found it to be 2.8, calculate your p-value.

Since the normal distribution is symmetric, negative values of z are equal to its positive values.

Therefore, 2.8 in the z column and the corresponding value of 0.00 we get p-value as 0.0026.

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