Understanding Normal, Z, and T Distributions in Statistics #3558388 (License: Personal Use)

The top-left panel shows a bimodal distribution with two distinct modes and a central mean over time; the top-right displays a standard Z-distribution (normal curve); the bottom-left features a T-distribution with heavier tails; and the bottom-right directly compares Z and T curves to emphasize tail behavior under small sample conditions.

Used in educational content for statistics courses, data science blogs, or academic tutorials explaining hypothesis testing and confidence intervals-especially when introducing the t-test versus z-test decision framework.