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 $$\mu _ { 0 }$$

Question

Quizplus · Accepted Answer

The null distribution is indeed the distribution of the test statistic under the assumption that the null hypothesis is true, and it is typically mound-shaped (bell-shaped) and symmetric around the mean specified by the null hypothesis ($\mu_0$), especially in the case of large sample sizes due to the Central Limit Theorem.

The Null Distribution Is the Distribution of the Test Statistic μ0\mu _ { 0 }μ0​

The Null Distribution Is the Distribution of the Test Statistic $\mu _ { 0 }$