The null hypothesis refers to a specified value of the population parameter,not a sample statistic.

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The null hypothesis is a statement about the population parameter, not the sample statistic. It is commonly denoted as H0 and is used to test whether there is a significant difference between two groups or variables. The alternative hypothesis, on the other hand, is a statement that contradicts the null hypothesis and suggests that there is a significant difference between the two groups or variables being studied.

The Null Hypothesis Refers to a Specified Value of the Population