Test your understanding of spread with range, interquartile range (IQR), and standard deviation. You’ll work through quick calculations and interpretation questions, including choosing the best measur...
Pick a difficulty and question count to begin.
Range, IQR, and standard deviation are the core tools for describing variability, and this quiz helps you use them correctly in real data situations.
Every question is multiple-choice with 4 options and no timer, so you can focus on accuracy and reasoning rather than speed.
You’ll practice calculating range and IQR from raw data or a five-number summary, and interpreting what each value says about spread.
Standard deviation items mix computation sense (what changes SD) with interpretation (how tightly values cluster around the mean).
Difficulty is balanced: easier questions build confidence with definitions and basic calculations, while harder ones test interpretation, outliers, and choosing the best spread measure.
Before you start, choose your question count and difficulty to match your goal—short sets for quick review, or longer runs to build consistency across mixed problem types.
What is the formula for calculating the range of a dataset?
What does IQR stand for in statistics?
Which of the following is a measure of variability?
This quiz has 101 questions on range, IQR, and standard deviation.
No. The quiz is untimed so you can work through calculations and interpretation carefully.
Each question is multiple-choice with 4 options.
Yes. You can adjust question count and select a difficulty level before starting.
A frequent error is not sorting the data or confusing IQR (Q3−Q1) with the overall range.

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