Z-Test & Confidence Interval Explained with One Easy Exam Problem (Step-by-Step)

📊 **Z-Test & Confidence Interval Explained with One Easy Exam Problem (Step-by-Step)** In this video, you will learn how to solve a real exam-level problem using: ✔️ Hypothesis Testing (Z-Test) ✔️ Confidence Interval (90%) We take a simple and practical example of a retail store to understand: 👉 How to test a claim using Z-test 👉 How to calculate the test statistic step-by-step 👉 How to make the correct decision using critical values 👉 How to find and interpret the confidence interval --- 🎯 **Topics Covered:** * Z-Test for large samples * Hypothesis formulation (H₀ and H₁) * Level of significance (5%) * Two-tailed test * Confidence Interval calculation * Interpretation of results --- 📚 **Perfect for:** * Engineering students * B.Sc / B.Com students * Statistics & Probability learners * Exam preparation (Semester / Competitive exams) --- 💡 **Why watch this video?** This single problem will help you clearly understand both **hypothesis testing** and **confidence interval**, which are very important for exams. --- 👍 If you found this helpful: Like 👍 | Share 📤 | Subscribe 🔔 --- #Statistics #ZTest #HypothesisTesting #ConfidenceInterval #EngineeringMaths #ExamPreparation #EasyLearning