A bank is building a fraud detection system. One analyst argues that every suspicious transaction should be flagged, even if many legitimate customers get blocked. Which response is the best?

A hospital is using anomaly detection to identify patients with a rare but dangerous condition. Which mistake is often more concerning?

A team fits a predictive model and then bootstraps the dataset many times. They find that the estimated model performance varies a lot across resamples. What does this suggest, and how should it affect their confidence in the model?

Why is cross-validation commonly used when comparing predictive models?

A supermarket analyst says, “Milk and bread are often purchased together, so clustering is the best method to discover that pattern.” Which response is the best?

Which of the following pathways of cell respiration takes place in the mitochondria

What is a key idea that distinguishes random forests from plain bagging of trees?

A streaming company wants to divide users into groups based on viewing behavior, without any labeled outcome. Which learning setup best matches this goal?

During intramembrnaous ossification, the periosteum forms before the center of ossification

ATP is included in which class of organic macromolecules