Some statistical tests allow you to make a conclusion that there is a real effect with 100% certainty.

Question

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No statistical test can provide a 100% certainty that there is a real effect. There is always a chance of error or variability in the results, even if it is a very small one. Therefore, statistical conclusions are usually stated with a certain level of probability or confidence, such as 95% or 99%.

Some Statistical Tests Allow You to Make a Conclusion That