T-Distribution

Definition

The t-distribution is a probability distribution that is used in statistical inference for small sample sizes or when the population standard deviation is unknown. It is similar to the normal distribution but has thicker tails.

Related terms

Degrees of Freedom: In statistics, degrees of freedom represent the number of values that are free to vary in a calculation. For the t-distribution, it determines its shape and variability.

Confidence Interval: A confidence interval is an estimate range within which we believe the true population parameter lies with a certain level of confidence. The t-distribution is often used to calculate confidence intervals.

Student's t-test: This is a statistical test that compares means between two groups to determine if they are significantly different from each other. It uses the t-distribution to calculate test statistics and p-values.