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# Unit 2: Analyzing a single quantitative variable

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## About this unit

This unit covers common measures of center like mean and median. We'll also learn to measure spread or variability with standard deviation and interquartile range, and use these ideas to determine what data can be considered an outlier.### Learn

### Practice

- Sample standard deviationGet 3 of 4 questions to level up!
- Visually assess standard deviationGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

### Practice

- Comparing distributionsGet 3 of 4 questions to level up!

### Learn

### Practice

- Calculate percentilesGet 3 of 4 questions to level up!
- Calculating z-scoresGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

### Learn

### Practice

- Normal distribution: Area above or below a pointGet 3 of 4 questions to level up!
- Normal distribution: Area between two pointsGet 3 of 4 questions to level up!
- Normal calculations in reverseGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 320 Mastery points

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Level up on all the skills in this unit and collect up to 900 Mastery points!