CodeHS Artificial Intelligence and Machine Learning Fundamentals

Question 1

Which of the following best describes machine learning?

Accepted Answer

A subset of AI where systems learn patterns from data without being explicitly programmed

Answer

A system that follows explicitly programmed rules to make decisions

Answer

A programming language used exclusively for robotics

Answer

A type of database management system

Question 2

In a supervised learning model, what is the role of labeled training data?

Accepted Answer

It provides input-output pairs so the model can learn the mapping between them

Answer

It is used only to test the model after training is complete

Answer

It stores the model's weights after training

Answer

It eliminates the need for a validation set

Question 3

What is the primary purpose of a neural network's activation function?

Accepted Answer

To introduce non-linearity so the network can learn complex patterns

Answer

To initialize the weights of the network

Answer

To split data into training and testing sets

Answer

To calculate the learning rate

Question 4

Which machine learning approach is best suited for training an agent to play a video game by rewarding good moves?

Accepted Answer

Reinforcement learning

Answer

Supervised learning

Answer

Unsupervised learning

Answer

Transfer learning

Question 5

What does 'overfitting' mean in the context of machine learning?

Accepted Answer

The model learns the training data too well, including noise, and fails to generalize

Answer

The model performs poorly on both training and test data

Answer

The model is too simple to capture patterns in the data

Answer

The training process takes too long to converge

Question 6

Which of the following is an example of unsupervised learning?

Accepted Answer

Customer segmentation grouping similar buyers without predefined categories

Answer

Spam email classification using labeled examples

Answer

Image recognition trained on labeled photos

Answer

Predicting house prices from historical sales data

Question 7

In the CodeHS AI curriculum, what is a 'training set' used for?

Accepted Answer

Teaching the model by exposing it to examples so it can learn patterns

Answer

Evaluating the final model's real-world performance

Answer

Adjusting hyperparameters during model selection

Answer

Storing model predictions for later analysis