The null distribution is the distribution of the test statistic assuming the null hypothesis is true; it mound shaped and symmetric about the null mean $\mu _0$ .

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The null distribution represents the distribution of the test statistic under the assumption that the null hypothesis is true, and it is typically symmetric and centered around the null mean $\mu_0$.

The Null Distribution Is the Distribution of the Test Statistic μ0\mu _0μ0​

The Null Distribution Is the Distribution of the Test Statistic $\mu _0$