19. What is A/B testing, and how do you analyze the results?

Comparing two versions (A & B) to see which performs better.

Use t-tests or proportions test, check for statistical significance.


20. What is a Chi-square test, and when is it used?

Tests independence between categorical variables.

Used in contingency tables (e.g., is gender associated with purchase behavior?).

Credits: https://whatsapp.com/channel/0029VaGgzAk72WTmQFERKh02

Hope it helps :)