Hypothesis Testing: An Intuitive Explanation

Learn the step-by-step breakdown of hypothesis testing.

How do the pharmaceutical companies check if their current vaccine is effective against the new COVID variant?

They first start with a hypothesis.

Hypothesis is a premise, a claim or an educated guess, based on prior knowledge and observation.

So how do we test if our claim is statistically valid?

The plausibility of a hypothesis is accessed by employing Hypothesis testing. Hypothesis testing is performed by using random sample data coming from a larger population.

A hypothesis test is a test between two competing hypothesis, a Null hypothesis versus an Alternative hypothesis

What is the Null and Alternative Hypothesis?

The Null hypothesis is default or the status quo for a parameter or can be the equality between population parameters.

The Alternative hypothesis is the claim to be tested and always mutually exclusive to the Null hypothesis, a mathematical opposite to the null hypothesis. The alternative hypothesis challenges the Null hypothesis. The Alternative hypothesis is also referred to as the Research hypothesis as it is the claim the researcher wants to establish or find evidence to support.