Classification Quiz

What is the primary goal of a classification algorithm in machine learning?

• Predict a continuous value

• Group similar data points together

• Predict a discrete label or category

• Reduce the dimensionality of data

Which of the following algorithms is typically used for classification tasks?

• Least Squares

• Linear Regression

• Logistic Regression

In binary classification, what does the ROC curve plot?

• Precision vs F1

• True Positive Rate vs False Positive Rate

• Accuracy vs Error Rate

• Sensitivity vs Specificity

Which of the below metrics is best used when dealing with imbalanced classes?

• Accuracy

• Mean Squared Error

• F1-Score

• R-squared

Which of the following is an example of a multi-class classification problem?

• Predicting stock prices

• Identifying species of flowers from petal data

• Detecting spam emails (spam or not)

What is the main purpose of logistic regression in machine learning?

• Predict continuous values

• Classify data into categories

• Reduce dimensionality

• Perform clustering

2. Which mathematical function does logistic regression use to map predictions to probabilities?

• Linear function

• Sigmoid function

• ReLU function

• Tanh function

Which of the following is the activation function used in logistic regression?

• Linear function

• ReLU function

• Sigmoid function

• Tanh function

In logistic regression, what does the threshold (typically 0.5) determine?

• A) Learning rate

• B) Model complexity

• C) Classification decision

• D) Feature importance

What type of loss function is commonly used in logistic regression?

• Mean Squared Error

• Hinge Loss

• Cross-Entropy Loss

• Huber Loss