論理学ドリル vs Introductory Statistics Tutor

Logic Drill takes you from your first logical symbols through natural deduction and predicate logic, one step at a time. Available in Japanese and English. The interface, lessons, drills, and explanations follow your device language. The app has 9 chapters of text and 10 drill units. Each unit works through a set of stages — read, tell apart, choose, connect, build — skipping any stage that doesn't fit the content (translation and fallacy units, for example, don't need all five). ■ What you'll learn • Logical connectives and truth tables • Tautologies, contradictions, and the validity of an argument • Natural deduction (∧, →, ∨, negation, reductio ad absurdum) • Predicate logic (∀, ∃) • Translating everyday sentences into logical formulas • Formal and informal fallacies • Sequent calculus (Γ ⊢ Δ) ■ Designed to be easy to work through • Learn what the symbols mean starting from everyday words like "and," "or," and "not" • A built-in truth table calculator checks any formula you enter, instantly • Translation answers are checked for logical equivalence, not just matching text • For invalid arguments, you can see a counterexample where the premises hold but the conclusion doesn't • Progress is saved on your device — no account needed The app shows a banner ad at the bottom of the screen. A one-time in-app purchase removes ads. There's no reward-ad tier, no subscription, and no AI explanation feature.

Introductory Statistics Tutor helps you explore statistical ideas, practise them, and understand what results mean. LEARN Follow guided lessons across 15 topics, from describing data and probability to sampling, confidence intervals, hypothesis tests, correlation, regression, and ANOVA. EXPLORE Experiment with 14 interactive labs. Change inputs, make a prediction, observe the result, and explain what it means. PRACTICE & MASTER Work through 600 conceptual assessment questions with visual prompts and explanations. Review areas that need attention and prepare with a 60-question exam simulation. REFERENCE & PROGRESS Look up formulas, assumptions, and guidance for choosing statistical methods. Track lesson completion and practice performance. Choose your preferred app language in Settings. Topic 1 is free. One in-app purchase unlocks the remaining curriculum, interactive labs, and advanced review tools. Designed for students learning introductory statistics.