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.
These 10 free DSBIZ questions are organized by exam domain, so you can see how each part of the Data Science for Business Professionals blueprint is tested. Reveal the answer and explanation under each question.
The head of delivery operations already has forecasts of tomorrow's orders and travel times. She now needs a system to assign deliveries to vehicles, minimizing total mileage while respecting vehicle capacities and promised delivery windows. Which capability connects the forecasts to this operational decision?
Correct answer: C - Prescriptive analytics to select a feasible, minimum-mileage delivery plan
Hands-on work time per service ticket has a long right tail because a few legitimate cases need much more staff attention. The case mix is expected to remain similar. Finance needs to estimate total staff hours for next month's workload; customer experience needs a typical-ticket measure that resists those extreme cases. Which pairing serves both purposes?
Correct answer: B - Mean for staffing demand; median for the typical ticket.
The research team wants to describe the experience of everyone who held a subscription at the start of the quarter, including those who later canceled. Its survey invitation appears only after login, so canceled subscribers cannot see it. Response volume is already high. Which revision addresses the central sampling problem?
Correct answer: A - Sample the full start-of-quarter subscriber list, including canceled accounts, through an accessible channel.
An online bookstore's recommendation engine relies on patterns in readers' past purchases. Newly released titles rarely appear because they have no purchase history, even when their genres and authors match a reader's interests. What change would allow relevant recommendations of these titles immediately?
Correct answer: A - Add content-based matches between new books' attributes and each reader's stated or inferred preferences.
Last month, a payment processor's model flagged 240 transactions. Reviewers confirmed that 48 of those alerts were genuine fraud. Across all transactions, 60 frauds were eventually identified. A manager says, 'We caught 80% of fraud, so 80% of our alerts were genuine.' Which statement correctly interprets last month's results?
Correct answer: D - Precision was 20%; the 80% figure describes recall, not the fraud share among alerts.
Customers offered a retention discount renew more often than customers who receive no offer. Account managers chose the recipients, favoring customers they believed were easiest to retain. Before expanding the program, which evidence would most directly establish whether the offer itself changes renewal behavior?
Correct answer: B - Renewal rates after random assignment of eligible customers to offer and no-offer groups
A model is intended to predict subscription cancellations 30 days in advance. Its strongest input is 'final refund amount,' a field populated only after cancellation is completed. Performance is excellent on both training data and a randomly held-out test set drawn from the same historical records. Which diagnosis best fits these findings?
Correct answer: B - Target leakage: the model uses information that arrives after the prediction deadline.
An inventory-forecasting proposal projects $180,000 in first-year savings before project costs. Implementation will cost $90,000, and first-year operation and monitoring will cost another $30,000. The investment committee requires first-year ROI of at least 40%, calculated as net benefit divided by total first-year project cost. All other approval conditions have been met. What should the committee conclude?
Correct answer: A - ROI is 50%; approve because the net return exceeds the required threshold.
A market analyst asks a generative AI assistant to summarize competitors' financial results. Its response includes a precise revenue figure and a confidently worded citation. The cited report exists, but the figure does not appear in it. Which review practice addresses the failure actually observed?
Correct answer: D - Verify each material claim against the underlying source before publication.
A business intelligence manager discovers that a link to a customer-level export is accessible without authentication. The file contains names, contact details, and purchase histories. Access logs show that an unknown external user is downloading it now. The manager can revoke the link immediately. What takes priority?
Correct answer: C - Revoke the link, preserve the access logs, and activate the organization's incident-response procedure.
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