True. The null hypothesis (denoted as H0) is a statement about a population parameter, typically a population mean or proportion, and it is formulated based on the assumption that there is no effect, relationship, or difference in the population.
However, in statistical hypothesis testing, data is often collected from a sample, not the entire population, due to practical limitations.
The sample data is then used to assess the evidence against the null hypothesis.
The null hypothesis is always stated in terms of the population, even though the data being analyzed comes from a sample.