# What is a null hypothesis?

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What is a null hypothesis?

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Step 1

Hypothesis:

Hypothesis is an assumption about the parameter of the population which will be made on the limited evidence as the start value to proceed for further investigation, and the assumption may or may not be true.

In testing the hypothesis is of two types. The two types are:

• Null hypothesis (H0)
• Alternative hypothesis (H1)
Step 2

Null and alternative hypotheses:

Null hypothesis:

Null hypothesis is a statement which is tested for statistical significance in the test. The decision criterion indicates whether the null hypothesis will be rejected or not in the favor of alternative hypothesis. In other words it can be said that, the null hypothesis is a statement which indicates the relationship between statistical measurements, distributions or categories. More often, null hypothesis states no significance relationship between variables or populations. But, null does not indicate “0” all the time.

Alternative hypothesis:

Alternative hypothesis is contradictory statement of the null hypothesis.

Step 3

Examples of null hypothesis:

Suppose while tossing a coin we want to test whether the coin is unbiased or not, and the probability for the occurrence of head is p= 1/2

Now, the null and alternative hypothesis will be as follows:

Null hypothesis (H0): p = 1/2

Alternative hypothesis (H1):  p≠1/2

Some othe...

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### Statistics 