MCQ for Data Analyst
51. What is a decision tree in machine learning? A method to visualize time series data A model that makes decisions by splitting data into branches A clustering algorithm A method for scaling features Submit 52. What is a confusion matrix in classification problems? A matrix that stores missing data A table showing the true positives, true negatives, false positives, and false negatives A method to calculate correlation A clustering method Submit 53. What does R-squared measure in regression analysis? The slope of the regression line The proportion of variance in the dependent variable explained by the independent variables The correlation between two variables The difference between predicted and actual values Submit 54. What is the difference between classification and regression in machine learning? Classification predicts categories; regression predicts continuous values Classification predicts continuous values; regression predicts ca