The conversation between human and AI assistant.
How can one interpret a negative t-value in a student test (p-value is very low)?
Okay, I see. Can you explain the difference between a one-tailed t-test and a two-tailed t-test?
Sure. A one-tailed t-test tests for a difference in only one direction, either positive or negative. A two-tailed t-test tests for a difference in either direction.