🤖 Round 7 — Machine Learning & Decision Trees
Complete Guide From Scratch for Fresher Data Analyst
What to expect: 25–40 minutes. Given the company name "DecisionTree Analytics," expect deep questions on the decision tree algorithm. This is NOT optional preparation — this is the round where the company's identity meets your technical skills.
1. What is Machine Learning?
Machine Learning is the practice of teaching computers to learn patterns from data and make predictions, without being explicitly programmed for every scenario.
Types of ML
🧠 SQL/Python/Tableau = data SAMAJHNA. ML = data se PREDICT karna. DecisionTree mein dono chahiye.
Common ML Algorithms at a Glance
| Algorithm | Type | Use Case | Interpretability |
|---|---|---|---|
| Linear Regression | Regression | Sales forecasting | ⭐⭐⭐ High |
| Logistic Regression | Classification | Churn prediction | ⭐⭐⭐ High |
| Decision Tree | Both | Customer segmentation | ⭐⭐⭐ High |
| Random Forest | Both | Fraud detection | ⭐⭐ Medium |
| KNN | Both | Recommendation system | ⭐⭐ Medium |
| Naive Bayes | Classification | Spam filtering | ⭐⭐⭐ High |
| SVM | Classification | Image classification | ⭐ Low |
| XGBoost | Both | Competition-winning models | ⭐ Low |