Question 9
Domain 2 — Data, Machine Learning, and Model DevelopmentWhich type of data is MOST commonly augmented using techniques like pitch shifting and time stretching?
Correct answer: B
Explanation
Audio data is commonly augmented because sound can be altered while preserving its label. Techniques like "pitch shifting" and "time stretching" change the waveform without changing the underlying content, making them standard methods for expanding audio datasets.
Why each option is right or wrong
A. Video
B. Audio
Pitch shifting and time stretching are standard augmentation methods for waveform-based inputs, because they alter the signal’s frequency content or duration while keeping the underlying spoken or musical content intact. In exam terms, these are applied to audio data, not images or tabular records, since the operations are defined on sound waveforms and are used to increase dataset variety without changing the label.
C. Images