If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

- Biased and unbiased estimatorsGet 3 of 4 questions to level up!

- The normal condition for sample proportionsGet 3 of 4 questions to level up!
- Mean and standard deviation of sample proportionsGet 3 of 4 questions to level up!
- Finding probabilities with sample proportionsGet 3 of 4 questions to level up!

- Mean and standard deviation of sample meansGet 3 of 4 questions to level up!
- Sample means and the central limit theoremGet 3 of 4 questions to level up!
- Finding probabilities with sample meansGet 3 of 4 questions to level up!

Up next for you:#### Unit test

Level up on all the skills in this unit and collect up to 700 Mastery points!