--- title: "Tables, charts, and graphs" description: "Identify measurement-table headings, choose graph types, interpret axis labels, coordinates and even scales, explain fitted-line conventions and prediction limits, and calculate straight-line gradient" canonical: https://lightmysky.com/learn/science/tables-charts-and-graphs-mt_YHsUhi4Prc source: https://lightmysky.com/learn/science/tables-charts-and-graphs-mt_YHsUhi4Prc.md retrieved: 2026-11-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Tables, charts, and graphs Identify measurement-table headings, choose graph types, interpret axis labels, coordinates and even scales, explain fitted-line conventions and prediction limits, and calculate straight-line gradients from supplied points. Subject: Science · Area: Scientific Inquiry · Ages 12 to 13 Page: https://lightmysky.com/learn/science/tables-charts-and-graphs-mt_YHsUhi4Prc ## Ready when they can - Identifies the quantity and unit in a measurement-table heading. - Chooses graph types, identifies axis labels and coordinates, reads even scales, and explains limits of graph-based conclusions. - Explains straight-line fitting conventions and calculates or interprets a gradient using supplied points or units. ## Lesson: Tables, charts, and graphs Headings identify what a column records. For a measurement with a unit, include quantity and unit: Mass / g or Mass (g). Here g means grams, s means seconds, cm means centimetres and N means newtons, a force unit. Put numerical readings in rows. Category headings such as Colour and count headings such as Number of plants need no separate measurement unit. **Example.** Zara records spring length under added weight. Her headings are Weight / N and Spring length / cm. Her rows pair 0 with 8, 2 with 11, and 4 with 14. Each row keeps one weight with its measured length. Weight is a force measured in newtons, not a mass measured in grams. Bar charts compare categories, such as favourite pets. A line graph can connect readings in time order to show change. A scatter graph plots paired measurements, such as leaf length and width, without joining separate observations. For a spring investigation, plot added weight horizontally and length vertically, then inspect the pattern before fitting a line. *(drawing: Colours are categories. These bars show 4 red votes, 7 blue votes and 3 green votes. The picture has printed values, not a vertical scale.)* Label numerical axes with quantity and unit. Put time or the quantity you change on the horizontal x-axis, and the measured response on the vertical y-axis. In (x, y), read x first. Locate both values, then mark where they meet. Equal distances on an axis mean equal changes in value. The axes may use different steps. Halfway between 4 and 8 is 6. *(drawing: This is one numerical axis, not a complete graph. The marked value, 6 s, lies halfway between 4 s and 8 s.)* When points follow an approximately straight trend, use a ruler to draw a straight line through the middle of the scatter. Consider the distances of points on both sides. Equal numbers above and below are not enough on their own. The line need not touch every point or pass through zero. Use two well-separated points on the fitted line for its gradient; they need not be recorded observations. Gradient = change in y divided by change in x. Subtract both coordinates in the same order. Gradient units are y-units per x-unit. A negative gradient means y decreases as x increases. For spring length against weight, cm/N means centimetres of length change per added newton. A gradient describes change, not the total length. **Example.** A straight line passes through (1, 6) and (4, 12). The y-change is 12 - 6 = 6 and the x-change is 4 - 1 = 3. Its gradient is 6 / 3 = 2. If x is weight in N and y is length in cm, the gradient is 2 cm/N. A curved pattern may need a curved model. An upward scatter trend means larger x-values tend to occur with larger y-values; it does not prove that x causes y. A fitted line gives estimates, not exact future readings. Predictions outside the measured range have less support because the relationship may change there. **Recap.** Keep table values paired, label numerical axes with units, choose a graph for the question, and calculate a straight line's gradient as y-change divided by x-change. *The lesson revisions, questions, worked solutions and flashcards were written for this dataset.* ## Practice 15 questions on this page, each with its working shown. ## Needs first - [Recording data with diagrams and graphs](https://lightmysky.com/learn/science/recording-data-with-diagrams-and-graphs-mt_rDjtmDogJr) - [Scientific Quantities and Units](https://lightmysky.com/learn/science/scientific-quantities-and-units-mt_vdHqdaflog) ## Optional connections - [Precision, accuracy and significant figures](https://lightmysky.com/learn/science/precision-accuracy-and-significant-figures-mt_auJqTemMpI) - [Bar charts and time graphs](https://lightmysky.com/learn/mathematics/bar-charts-and-time-graphs-mt_ChjMU2GDJa) ## Opens up - [Drawing conclusions from evidence (age 12+)](https://lightmysky.com/learn/science/drawing-conclusions-from-evidence-age-12-mt_3jmBpEepYX)