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#sampling

2 posts tagged with “sampling”.

Stylised illustration of a busy tea stall in daylight, a crowd of many small customer figures spread across the frame, each wearing a small numbered token. On the left a man in burnt orange has set down two brass posts with a rope cordon looped around the handful of people nearest the counter, and holds a clipboard. On the right a woman in deep teal turns a brass lottery drum, and scattered evenly across the whole crowd, far beyond the rope, a dozen figures are ringed in teal to show who was drawn. Viji stands behind the counter between them.

Research

Probability and Non-probability Sampling Walk Into a Tea Stall

Viji asked the 40 people standing in front of him and got a clear answer: bun-butter. Then somebody drew 60 numbered tokens out of a drum and the answer changed completely. Two strangers explain why one of those samples has a margin of error and the other one cannot have one.

Vijayakumar P 13 min read
Stylised illustration of a tea stall, camera close on the counter. A large brass pot dominates the centre, drawn as a cut-away so hundreds of tiny indigo dots are visible inside it with a dashed line marked mu running down the middle and a label reading N days, every day this stall will ever run. On the left a woman in deep indigo stands beside a long paper scroll that unrolls off the left edge of the frame, the visible portion printed with N, mu and sigma, captioned and it keeps going. On the right a man in burnt amber holds a long brass ladle raised clear of the pot, its bowl holding a small spoonful of amber dots labelled n = 30, x-bar = 87. A card propped on the counter reads stir first, then taste. A wall thermometer on the far left reads 38 degrees.

Analytics

Population and Sample Walk Into a Tea Stall

Viji's notebook says the average is 87 customers a day. His cousin says that is the average of his notebook, not of his stall. Two strangers — one with a scroll that never fully unrolls, one with a brass ladle — explain the difference, and what it costs.

Vijayakumar P 11 min read

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