Scenario C: Decision Trees and EnsemblesYou train a decision…
Scenario C: Decision Trees and EnsemblesYou train a decision tree classifier for churn with different maximum depths.You observe the following test performance: Depth 2: Accuracy 0.78, Recall(churn) 0.30 Depth 6: Accuracy 0.82, Recall(churn) 0.40 Depth 20: Accuracy 0.80, Recall(churn) 0.28 If a tree splits first on tenure_months at 3 months, the best interpretation is:
Read DetailsScenario B: Customer Churn Classification A subscription bus…
Scenario B: Customer Churn Classification A subscription business wants to predict whether a customer will churn (cancel) next month. Target: churn (1 = churned, 0 = stayed). The business cares more about catching likely churners than about occasionally flagging a loyal customer. A model has high accuracy but low recall on churners. Most likely issue?
Read DetailsScenario A: Messy Retail Sales ExtractYou are analyzing a re…
Scenario A: Messy Retail Sales ExtractYou are analyzing a retail dataset with columns: date (string like “2025-03-01”) region (text with inconsistent capitalization and extra spaces) channel (“Online” or “Store”) price (numeric, may contain missing values) quantity (integer) Assume each row is an order line. You will clean the data and compute KPIs.You plot a histogram of revenue and see a long right tail. What does that typically indicate?
Read DetailsScenario A: Messy Retail Sales ExtractYou are analyzing a re…
Scenario A: Messy Retail Sales ExtractYou are analyzing a retail dataset with columns: date (string like “2025-03-01”) region (text with inconsistent capitalization and extra spaces) channel (“Online” or “Store”) price (numeric, may contain missing values) quantity (integer) Assume each row is an order line. You will clean the data and compute KPIs.You want total revenue by region. Which expression is best?
Read DetailsScenario B: Customer Churn Classification A subscription bus…
Scenario B: Customer Churn Classification A subscription business wants to predict whether a customer will churn (cancel) next month. Target: churn (1 = churned, 0 = stayed). The business cares more about catching likely churners than about occasionally flagging a loyal customer. If the business wants to catch churners, which error is typically worse?
Read DetailsScenario D: Revenue Prediction (Regression)A business predic…
Scenario D: Revenue Prediction (Regression)A business predicts weekly revenue using features like ad_spend, number_of_customers, and average_discount.Two models are evaluated on a held-out test set: Model A: R² = 0.62, RMSE = 18,000 Model B: R² = 0.58, RMSE = 16,000 Lower RMSE is better. Higher R² is better.In multiple regression, the coefficient on ad_spend is best interpreted as:
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