# What is mean by hypothesis test

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## What is a Hypothesis Test?

A hypothesis test is a type of statistical test used to determine whether there is enough evidence in a given sample to infer a certain condition or relationship. It is a method of making decisions using data from a sample. A hypothesis test evaluates two mutually exclusive statements about a population to determine which statement is best supported by the sample data.

Hypothesis testing is used to assess the plausibility of a hypothesis by using sample data. The hypothesis being tested is called the null hypothesis. The alternative hypothesis is the one you would believe if the null hypothesis is concluded to be untrue.

In a hypothesis test, the null hypothesis is usually the one that states that there is no difference between the population parameters being studied. The alternative hypothesis is the one that states that there is a difference between the population parameters being studied.

For example, if you were studying the average amount of time it takes for people to complete a task, the null hypothesis might be that there is no difference between the population mean and the sample mean. The alternative hypothesis might be that there is a difference between the population mean and the sample mean.

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The process of hypothesis testing involves four steps:

• State the null and alternative hypotheses
• Collect data and calculate a test statistic
• Compare the test statistic to a critical value and make a decision
• Interpret the results of the test

The test statistic is used to determine whether the null hypothesis should be rejected or not. This is done by comparing the test statistic to a critical value, which is determined by the significance level of the test. If the test statistic is greater than the critical value, the null hypothesis is rejected and the alternative hypothesis is accepted.

The interpretation of the results of a hypothesis test is based on the decision that was made. If the null hypothesis is rejected, the alternative hypothesis is accepted. If the null hypothesis is not rejected, the alternative hypothesis is not accepted.

Hypothesis testing is an important tool for making decisions in research. It allows researchers to make decisions based on data, rather than just relying on intuition. Hypothesis tests are used in many areas of research, including psychology, medicine, economics, and engineering.