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Definition “Correlation is easy to calculate and easy to misinterpret — the two properties that make it one of the most exam-tested topics in statistics. The Statistics Made Simple textbook covers correlation and its pitfalls with a modern, worked-example...
Definition “The least-squares method here is the same one that powers every regression model in modern data science, just done by hand. The Statistics Made Simple textbook builds this up from the same starting point with matching practice questions. Regression is a...
Definition Mode is the only measure of central tendency that works for categorical data. The Statistics Made Simple textbook covers mode alongside mean and median with a modern, worked-example approach. The mode is defined as the value in the data, which occur the...
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The Complete Bundle brings together everything we have built for AP and Cambridge A-Level Economics students: the full 914-page supplementary textbook, a 450-question practice workbook with mark schemes, a rapid-revision flashcard deck, and 100 real-world case studies with expert analysis. Four products, one price — designed to take you from first principles to exam-ready.
Most students use the textbook to understand the theory, the practice questions to test themselves under timed conditions, and the flashcards in the final week before the exam. The case studies sit alongside both — every concept grounded in something that actually happened, from carbon pricing in Sweden to the 2008 financial crisis. It is the study system we wish we had when we were students.
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