It is conventionally 5% (or lower) but there is no good reason for that level.
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In order to solve this you need the null hypothesis value also level of significance only helps you decide whether or not to reject the null hypothesis, is the p-value is above this then you do not reject the null hypothesis, if it is below you reject the null hypothesis Level of significance has nothing to do with the math
Probability of failing to reject a false null hypothesis.
In hypothesis testing, this is the probability of failing to reject a false null hypothesis.
You should reject the null hypothesis.
Be able to reject the null hypothesis and accept the research hypothesis