Which statistical technique is most commonly used by mathematics textbook publishers to analyze seasonal sales patterns during back-to-school shopping festivals?

In the world of mathematics education products, data analytics plays a crucial role in understanding customer behavior and optimizing sales strategies. Publishers and educational technology companies rely on sophisticated mathematical models to gain insights from retail data. This poll tests your knowledge about how mathematical principles are applied in the product analytics of educational mathematics resources.

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Time Series Decomposition with Fourier Analysis
Simple Linear Regression with Dummy Variables
Chi-Square Goodness of Fit Tests
K-Means Clustering Algorithm