Sampling distribution of x-bar: x-bar has mean mu and standard deviation sigma/sqrt(n). For large n (or if the population is normal), x-bar is approximately normal.
How to apply it: The standard deviation of x-bar decreases as n increases, making estimates more precise.
Course: AP Statistics · Unit: Sampling Distributions
Practice questions about Sampling distribution of x-bar on AimFive — get rubric-based feedback showing exactly which points you earned.
AP and Advanced Placement are trademarks of College Board. AimFive is not affiliated with or endorsed by College Board.