Charts and Tables

How to use this category

Charts on this site are calculators with a picture, not decorations. The box plot computes the five-number summary and the fences, then draws them. The histogram bins the numbers you paste and tells you Sturges' suggestion. The bar chart takes labels and amounts. The scatter plot takes pairs and can show a line without pretending to be the inference page. The stem-and-leaf plot keeps the actual digits, which is the reason to use it on a small class.

Pictures without a table are posters, and this shelf refuses that. A chart that cannot be checked against a table is a poster. Every picture on this shelf is downstream of a calculation you can read. The box plot's whiskers stop at the last point inside the fences, and the dots beyond them are listed as numbers, not only as ink. The histogram tells you how many bins it used and what Sturges' rule would have suggested, because a different bin count is a different story. The bar chart does not sort unless you type the rows in the order you want. The scatter plot can carry a line and still is not the inference page. The stem-and-leaf plot is the right picture when the class is small enough that the digits themselves matter. If you need a test, leave the chart and open the test. The picture was never the p-value. Choose the chart by the question the picture has to answer, not by which one looks busiest. A box plot is the right picture when you need the middle, the spread, and the points that sit far away, and you do not need every raw value on the drawing. A histogram is the right picture when the shape of a larger list matters more than any single number, and you are willing to say how many bins you used. A bar chart is the right picture when the categories are names rather than measurements, because a histogram of names would be a mistake. A scatter plot is the right picture when both axes are measurements and you want to see whether they travel together before you open the correlation page. A stem-and-leaf plot is the right picture when the group is small and hiding the digits would throw away the only interesting part. If none of those jobs matches the question, do not force a picture. Report the number from the descriptive page and leave the shelf.

The cards above are the whole category, with one sentence on the job each page actually does. Open a page when that sentence matches the decision in front of you. If the sentence is close but the assumption is wrong, read the comparison section on the page before you copy a number into a report, a bid, or a lesson plan.

Worked examples are prefilled so the first result is auditable. Change one input and the ticket updates. The essay under the ticket walks the same arithmetic in sentences, then a second example, then the move that most often breaks the definition. Five questions at the end answer the objections a careful reader raises after seeing the figure. That structure is repeated because the habit of checking is the point, not because the formulas are the same.

Internal links leave this category only when the next formula genuinely lives next door. A standard deviation page may point at variance and at a t test. It should not point at a decking calculator. If you arrived from search on a broad word, use the one-sentence descriptions to discard the near misses. Near misses are how people report a p-value from a test they did not run.

Each worksheet in Charts and Tables keeps one H1, a canonical URL that matches the tool name, and meta text sized for search snippets. The steps are part of the page, not a hidden modal. If you teach from these pages, project the ticket and the assumptions together so students see the same definition you graded against.

When two tools in Charts and Tables look alike, read the blurb under each name before you commit. The difference is usually a divisor, a critical value, a waste percent, or a caution that belongs on one page and not the other. That difference is why the URLs stay separate.

Reviewed 21-10-2026. Pages in Charts and Tables currently include Bar Chart Maker, Box Plot Calculator, Frequency Table Calculator, Histogram Maker, Scatter Plot Maker, Stem and Leaf Plot Calculator.

Every charts and tables page

• Bar Chart Maker Tallies categories or uses typed labels and values to produce bar heights and percents.
• Box Plot Calculator Builds a five-number summary with fences and lists mild and extreme outliers for a box plot.
• Frequency Table Calculator Builds a frequency and relative-frequency table from raw numbers or category labels.
• Histogram Maker Bins numeric data into equal-width classes and reports frequencies for a histogram.
• Scatter Plot Maker Summarizes paired x,y points with correlation, means, and ranges for a scatter plot.
• Stem and Leaf Plot Calculator Splits integers into stems and leaves and prints a stem-and-leaf display.