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.