Statistical tests are methods used to determine if there is a significant difference between groups or if a relationship exists between variables. Each test has its specific Statistical Assumptions and applications.

Types of Statistical Tests

Z-Test

T-test

Chi-Squared Test

Proportion Test

Test Statistics

For each statistical test, a test statistic is calculated. This statistic measures the degree of deviation from the null hypothesis (Hypothesis testing). The estimator is centered by the population mean, and then it is divided by the population standard deviation, a process known as Standardisation.