Why p-value is 0 when testing distribution

Question

I want to check the distribution of the sample, I tried several tests like kstest. But I always got the result p-value = 0. Why?

Answer 1

When you perform a statistical test, you have two hypotheses:

• null hypothesis. Often call H_0. In your case, the null hypothesis is that the data comes from a normal distribution.
• alternative hypothesis. Often call H_1 or H_A. In your case, the data comes from an abnormal distribution.

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Answer 2

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[H, P] = KSTEST (...) P- P.

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Answer 3

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