how to reject null hypothesis with p value

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1. Solved What is the p value? Do you reject the null

   

2. Solved If p-value , reject the null hypothesis. Otherwise,

   

3. Null hypothesis

   

4. Review p-values to reject or not reject the null hypothesis.

   

5. statistics

   

6. “Reject the null hypothesis if p-value is less than 0.05.” Why exactly?