21 Which one of the following is true? A The significance level of a test is the probability that the null hypothesis is false. A null hypothesis is rejected at the 0.025 level is also rejected at 0.05 level of significance. If a null hypothesis is rejected against an alternative at the 5% level, then using the same data, it must be rejected against that alternative at the 1% level D The p-value of a test is the probability that the null hypothesis is true. None of the suggested answers are correct

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