What’s on the Quality Control poster
Accuracy against Precision, side by side.
- Accuracy: Closeness to the true value
- Accuracy: Affected by systematic error
- Accuracy: Improved by calibration
- Accuracy: Checked against a reference material
- Precision: Closeness of repeats to each other
- Precision: Affected by random error
- Precision: Improved by repetition and technique
- Precision: Quantified by standard deviation
- A method can be precise and inaccurate — consistently wrong. That is the most dangero…
Report a mean with a standard deviation and a sample size. Any one of the three alone is uninterpretable.
Questions about the Quality Control poster
- What’s on the Quality Control poster?
- Accuracy against Precision, side by side. Accuracy: Closeness to the true value; Accuracy: Affected by systematic error; Accuracy: Improved by calibration; Accuracy: Checked against a reference material; Precision: Closeness of repeats to each other; Precision: Affected by random error; Precision: Improved by repetition and technique; Precision: Quantified by standard deviation; A method can be precise and inaccurate — consistently wrong. That is the most dangero…. Report a mean with a standard deviation and a sample size. Any one of the three alone is uninterpretable.
- Who is the Quality Control poster for?
- Quality Control belongs to the Chemistry section rather than to a school year, because physical science is not something one grade owns. Anyone learning analytical can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Quality Control poster?
- Accurate is close to the true value. Precise is close to each other. They are independent. A wall chart earns its place by being glanceable from where the work is happening, so Quality Control belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.
- What other posters go with Quality Control?
- Calibration, Indicators and Chromatography Methods sit alongside Quality Control in the Chemistry section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.CalibrationIndicatorsChromatography Methods
- Is the Quality Control poster free to download and print?
- Yes. Quality Control downloads as a free PDF with no account, no email and no watermark, like everything else in the Chemistry section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Quality Control poster print at?
- Quality Control is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Quality Control loses nothing.Printing guide
Related posters
Charts that sit alongside Quality Control on the same wall.
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