What’s on the Sampling poster
A 6-row table: Method · How · Bias.
Method against representativeness.
- Random — Every member equally likely — Low — but rarely achieved
- Systematic — Every nth member — Low, unless a pattern exists
- Stratified — Proportional by subgroup — Low; needs known strata
- Opportunity — Whoever is available — High — the commonest
- Volunteer — Self-selecting — High — volunteer bias
- Snowball — Referred by participants — High; useful for hidden populations
Undergraduate psychology students are the most-studied population in the discipline, and are not representative of anyone.
Questions about the Sampling poster
- What’s on the Sampling (Methods & statistics) poster?
- A 6-row table: Method · How · Bias. Method against representativeness. Random — Every member equally likely — Low — but rarely achieved; Systematic — Every nth member — Low, unless a pattern exists; Stratified — Proportional by subgroup — Low; needs known strata; Opportunity — Whoever is available — High — the commonest; Volunteer — Self-selecting — High — volunteer bias; Snowball — Referred by participants — High; useful for hidden populations. Undergraduate psychology students are the most-studied population in the discipline, and are not representative of anyone.
- Who is the Sampling (Methods & statistics) poster for?
- Sampling (Methods & statistics) belongs to the Psychology section rather than to a school year, because life science is not something one grade owns. Anyone learning methods & statistics can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Sampling (Methods & statistics) poster?
- Random sampling is rare in practice. Opportunity sampling dominates, and it is the least representative. A wall chart earns its place by being glanceable from where the work is happening, so Sampling (Methods & statistics) belongs on the wall where that life science work actually happens, within glancing distance, rather than filed away.
- What other posters go with Sampling (Methods & statistics)?
- Choosing a Test, Descriptive Statistics and Research Ethics sit alongside Sampling (Methods & statistics) in the Psychology section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Choosing a TestDescriptive StatisticsResearch Ethics
- Is the Sampling (Methods & statistics) poster free to download and print?
- Yes. Sampling (Methods & statistics) downloads as a free PDF with no account, no email and no watermark, like everything else in the Psychology 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 Sampling (Methods & statistics) poster print at?
- Sampling (Methods & statistics) 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 Sampling (Methods & statistics) loses nothing.Printing guide
Related posters
Charts that sit alongside Sampling on the same wall.
Browse every Psychology poster, or start from the full catalogue.