Which mathematical principle fundamentally transformed market research by determining the optimal sample size needed for statistically significant results at a 95% confidence level?

Market research is a critical component of product development and marketing strategy, but did you know there's significant mathematical theory behind effective survey design? From sampling methodologies to statistical confidence intervals, mathematics plays a crucial role in ensuring market research yields reliable insights. This trivia question explores an interesting mathematical concept that revolutionized how researchers approach survey design for maximum statistical validity.

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The Central Limit Theorem
Bayes' Theorem
Fibonacci Sequence
Euler's Identity