By the 1940s, Gallup had switched from quota sampling to probability sampling because it provided more accuracy and reliability in predicting election outcomes.

Question

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By the 1940s, Gallup indeed switched from quota sampling to probability sampling because it recognized that probability sampling, where every member of the population has a known and non-zero chance of selection, offered more accuracy and reliability in predicting election outcomes, especially after the famous failure in predicting the 1948 presidential election outcome using quota sampling.

By the 1940s, Gallup Had Switched from Quota Sampling to Probability