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Review of population and sample standard deviation, including the formula and interpretation.
Standard deviation measures the spread of a data distribution. The more spread out a data distribution is, the greater its standard deviation. For example, the blue distribution on bottom has a greater standard deviation (SD) than the green distribution on top:
Calculating standard deviation step by step. Standard deviation of a population. Mean and standard deviation versus median and IQR. Concept check: Standard deviation. Statistics: Alternate variance formulas.
Calculating standard deviation step by step. Standard deviation of a population. Mean and standard deviation versus median and IQR. Concept check: Standard deviation. Statistics: Alternate variance formulas.
Calculating standard deviation step by step. Standard deviation of a population. Mean and standard deviation versus median and IQR. Concept check: Standard deviation. Statistics: Alternate variance formulas.
Six questions that will help you understand standard deviation more deeply. Skip to main content If you're seeing this message, it means we're having trouble loading external resources on our website.
Visually assessing standard deviation (video) | Khan Academy. Explore. Search. AI for Teachers.
Learn about the variance of a population with examples and explanations on Khan Academy.
Basic normal calculations. Math>. AP®︎/College Statistics>. Exploring one-variable quantitative data: Percentiles, z-scores, and the normal distribution>. Normal distributions and the empirical rule.