Null Hypothesis Relates toa.Sample statisticb.Population Parameterc.Sampling Distributiond.indipendent Variable

The null hypothesis relates to the population parameter. So, the correct answer is b. Population Parameter.

Here's a step-by-step explanation:

1. The null hypothesis is a statistical theory that suggests that there is no statistical relationship and significance that exists between a set of observed data.

2. This hypothesis assumes that any kind of difference or importance you see in your data is due to chance.

3. The null hypothesis is always about a population parameter, not about the sample statistic.

4. For example, if your null hypothesis is "The average age of a certain group of individuals is 30", the population parameter here is the average age of the group, which is 30.

5. Therefore, the null hypothesis is always about the population parameter, not the sample statistic, sampling distribution, or independent variable.