T-Test Statistical test

What is a T-Test?

A T-Test is a statistical hypothesis test used to determine if there is a significant difference between the means of two groups.

Types

Independent T-Test

• Compares means of two separate groups
• Example: Disease group vs. healthy group

Paired T-Test

• Compares means from the same group at two times
• Example: Before treatment vs. after treatment

One-Sample T-Test

• Compares sample mean to a known value
• Example: Is this group's mean different from 100?

Assumptions

• Data is continuous
• Samples are independent
• Data is approximately normally distributed
• Equal variances (can be adjusted)

Interpretation

• p < 0.05: Significant difference
• p >= 0.05: No significant difference

Related Terms

• P-Value: Statistical significance measure
• ANOVA: Compares more than two groups