A statement whose validity is tested on the basis of a sample is called?*b) Statistical Hypothesisd) Composite Hypothesisc) Simple Hypothesisa) Null Hypothesis

The correct answer is b) Statistical Hypothesis.

Explanation:

A hypothesis is a statement or claim about a population parameter. In statistics, we often test hypotheses using sample data. A statistical hypothesis is specifically a declarative statement that can be tested statistically.

There are different types of hypotheses:

1. Null Hypothesis (H0): A general statement that there is no effect or no difference, and it serves as the default or starting assumption to be tested.
2. Alternative Hypothesis (Ha): Represents what we want to test, indicating that there is an effect or a difference.

In summary, the term that encompasses statements whose validity is checked using sample data is referred to as a "Statistical Hypothesis".