10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CDSP exam has 90 questions and runs 2 hours.
These 10 free CDSP questions are organized by exam domain, so you can see how each part of the Certified Data Science Practitioner blueprint is tested. Reveal the answer and explanation under each question.
A retail company wants to predict subscription cancellations. Before selecting an algorithm, what should the data practitioner establish first?
Correct answer: B - Business objective, success metrics, stakeholders, and constraints
A dataset contains duplicate records, missing values, and inconsistent formats. What is the appropriate first approach?
Correct answer: B - Inspect, validate, clean, transform, and document the data
A practitioner combines public demographic data with internal customer records. What should occur before use?
Correct answer: A - Confirm permissions, privacy requirements, and data-use agreements
Which technique converts text documents into numerical representations for machine learning?
Correct answer: A - TF-IDF or Word2vec vectorization
A dataset contains extreme income outliers. Which central tendency measure is least affected by them?
Correct answer: B - Median
A categorical region variable is converted into separate binary columns. Which method was used?
Correct answer: B - One-hot encoding
Two input variables contain nearly identical information. Which approach helps reduce redundancy?
Correct answer: A - Feature selection or dimensionality reduction
A model predicts whether a customer will default or not default on a loan. Which problem type is this?
Correct answer: A - Classification
A fraud model incorrectly flags legitimate transactions as fraudulent. Which metric is especially relevant?
Correct answer: A - Precision
A model performs well on training data but poorly on new data. What issue is most likely?
Correct answer: A - Overfitting
The CDSP exam also covers these domains. Drill them in the full free practice test:
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