The first quartile (Q1) is defined as the 25th percentile, where the lowest 25% data lies below this point. It is also known as the lower quartile. The second quartile (Q2) is the median of a data set; thus …

Aug 3, 2025 · Discover what quartiles are in statistics, how to calculate them, and see examples to help you interpret data more effectively. Learn about lower, median, and upper quartiles.

Quartiles are the values that divide a list of numbers into quarters. To do this we halve the list at the median, then halve each of those...

Feb 6, 2026 · Quartile Deviation Quartile Deviation is defined as half of the distance between the first quartile and the third quartile. It is also known as the semi-interquartile range. The formula for …

May 20, 2022 · Quartiles & Quantiles | Calculation, Definition & Interpretation Published on May 20, 2022 by Shaun Turney. Revised on June 21, 2023. Quartiles are three values that split sorted data …

Q1 First quartile: 25% of the data are below this value (aka lower quartile). Q2 Second quartile / Median: This value splits the data in half. Q3 Third quartile: 25% of the data are above this value …

Oct 17, 2025 · Learn quartile concepts, calculation methods, and practical applications from scratch. Understand Q1, Q2, Q3, IQR, and how to calculate quartiles step-by-step with real examples.

Learn what quartiles are, how Q1, Q2, Q3, and the interquartile range work, and why they’re essential for understanding data distribution and variability.

Quartile In statistics, a quartile is an element in a data set, ordered from smallest to largest, that divides the set into four parts, or quarters. The four parts are more or less equal in size, but can vary slightly …

Apr 26, 2021 · This tutorial explains the difference between percentiles, quartiles, and quantiles, including several examples.