Khan Academy
Statistical & Non-Statistical Questions
Learn which questions expect many different answers.
Watch on YouTubeAsk statistical questions, choose the right plot, and describe data with measures of center and spread.
Quick read-throughs in plain language — then hit the videos below.
Statistical question: "How tall are kids in our class?" (heights vary). Non-statistical: "How tall is the door?" (one answer).
Mean = average. Median = middle number when sorted. Mode = most common value.
Try it
Find the mean of 4, 7, 7, 9, 12.
By the end of this unit, you should be able to:
Each video covers one topic from this unit — read the short blurb below to find the right one.
Learn which questions expect many different answers.
Watch on YouTubeMore examples of questions that need data to answer.
Watch on YouTubeCalculate each measure of center with worked examples.
Watch on YouTubeMeasure the spread of the middle half of your data.
Watch on YouTubeCompare the full spread vs. the middle 50%.
Watch on YouTubeShow how often each value appears in a data set.
Watch on YouTubeBuild a box plot step by step from raw data.
Watch on YouTubePick the best display for the question you are asking.
Watch on YouTubeSee how outliers change the center of a data set.
Watch on YouTubeAdam's curated problem sets — preview here or open in Google Drive.
Hand-picked links from Khan Academy and trusted worksheet libraries.
A few quick questions to make sure the big ideas stuck. Retake as many times as you want.
Unit 6: Statistics & Data Analysis
Find the median of: 4, 7, 2, 9, 5