A t-test is a statistical method used to determine if there is a significant difference between the means of two groups, which may be related in certain features. It is commonly used when the data sets, typically small, follow a normal distribution and have unknown variances.

T-test

t-test

Statistical methods are a collection of mathematical techniques used to analyze and interpret data, helping to make informed decisions based on empirical evidence. They encompass a range of procedures, including data collection, analysis, interpretation, and presentation, enabling researchers to draw valid conclusions and predictions from data samples.

statistical method

significant difference

means of two groups

Related features

data sets

Small data sets

The normal distribution, also known as the Gaussian distribution, is a continuous probability distribution characterized by its symmetrical bell-shaped curve, where the mean, median, and mode are all equal. It is fundamental in statistics because many natural phenomena and measurement errors are approximately normally distributed, making it a cornerstone for statistical inference and hypothesis testing.

normal distribution

unknown variances

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