Assessor Pack Data Analyst Quiz
Test your knowledge on key concepts and practices for data analysts.
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Quiz Questions & Answers
Review every prompt, the correct responses, and helpful context to prep for your own run-through.
Question 1: A stakeholder asks, “Which product is underperforming?” What should you do first?
Build a dashboard immediately
Define metrics, time window, and baseline performance
Run a correlation analysis
Check if competitors launched a new product
Question 2: Which is most appropriate to frame a churn problem?
Count refunds last quarter
Define churn cohort, observation window, and leading indicators
Compute average tenure
Segment by region only
Question 3: In ambiguous revenue decline, the best first step is:
Build a forecasting model
Form hypotheses tied to controllable drivers and decision thresholds
Compare week-over-week only
Interview sales reps without data
Question 4: Missing values in key fields should be handled by:
Dropping all rows blindly
Imputing with mean without checking distribution
Investigating mechanism (MCAR/MAR/MNAR) and documenting approach
Replacing with zero by default
Question 5: When joining two sources with conflicting keys, the best approach is:
INNER JOIN and ignore mismatches
LEFT JOIN with deduping and a data quality exception log
FULL JOIN and keep everything
CROSS JOIN to catch issues
Question 6: Detecting duplicates across multi-source ingestion is best done by:
Counting rows only
Hashing normalized record fields and checking collision rates
Checking IDs only
Visual scan in Excel
Question 7: Correlation vs causation—correlation means:
One variable causes the other
Variables move together without implying causality
There’s no relationship
They are independent
Question 8: Core requirement for valid A/B test:
Running during peak traffic
Randomization of assignment
Testing all users simultaneously
Using all KPIs as primary metrics