01
How would you analyse the declining sales of a retail store?
Show answer
Break sales into footfall, conversion and average basket, compare with last year and competitors, and check stock, pricing, staffing and local events.
D. E. Shaw Business Analytics Interview Questions & Answers
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02
What is the difference between SQL and Excel for analysis?
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Excel suits small to medium data and quick ad-hoc work; SQL queries large databases directly and repeatably.
03
Build a break-even analysis in Excel.
Show answer
Break-even units = Fixed costs ÷ (Price − Variable cost per unit).
Add a data table to test different price and volume scenarios.
04
What is a stakeholder and who are the typical stakeholders in a project?
Show answer
Anyone affected by or influencing the project: sponsors, product owners, end users, developers, testers, operations and customers.
05
What is sensitivity analysis?
Show answer
Testing how changes in key inputs such as price or volume affect the output, in Excel using data tables or scenario manager.
06
What is a primary key?
Show answer
A column or set of columns that uniquely identifies each row in a table and cannot contain NULL.
07
How do you prioritise requirements?
Show answer
Use MoSCoW (Must, Should, Could, Won't), value versus effort scoring or the Kano model, agreed with stakeholders based on business value and risk.
08
What does GROUP BY do and how is HAVING different from WHERE?
Show answer
GROUP BY aggregates rows by column; WHERE filters before grouping and HAVING filters after, using aggregate conditions.
09
What is the profit equation and how do you use it in cases?
Show answer
Profit = Revenue minus Cost, where revenue = price x volume and cost = fixed + variable. Split each part to find which one explains a change.
10
Guesstimate: how many cups of tea are sold in Delhi per day?
Show answer
Population about 20 million, adult tea drinkers about 50%, cups bought outside per person around 1 on average. This gives roughly 10 million cups, then adjust for offices and stalls.
11
What is a Minimum Viable Product (MVP)?
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The smallest version of a product with enough features to deliver value and gather real user feedback before investing more.
12
How do you manage conflicting requirements from two senior stakeholders?
Show answer
Clarify the underlying goals, present data and trade-offs, facilitate a joint session, escalate to the sponsor if needed and document the agreed decision.
13
What is a RACI matrix?
Show answer
A table assigning Responsible, Accountable, Consulted and Informed roles per task so ownership is clear.
14
How do you handle large datasets in Excel?
Show answer
Use tables, Power Query, remove volatile functions, filter before calculating and move to Power Pivot or a database when rows reach the millions.
15
What are wireframes and why are they useful for a BA?
Show answer
Low-fidelity layouts of screens that help stakeholders visualise and agree on requirements before development starts.
16
What is a process flow and which tools do you use?
Show answer
A diagram of steps, decisions and owners in a process, made using BPMN or flowcharts in tools like Visio, Lucidchart or draw.io.
17
Tell me about a time you handled a difficult stakeholder.
Show answer
Use STAR: Situation, Task, Action, Result. Show that you listened, found the underlying goal, used data to align people and reached a documented decision.
18
What is SQL and why do business analysts need it?
Show answer
A language for querying databases. BAs use it to pull data themselves, validate numbers, check reports and answer questions without waiting for engineers.
19
What is a feasibility study?
Show answer
An early assessment of whether a proposed solution is technically, economically, operationally and legally viable before committing budget.
20
Use case vs user story?
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A use case describes the full interaction between an actor and the system (main and alternate flows). A user story is a short statement of need from the user's point of view, refined with acceptance criteria.
21
Difference between INNER JOIN and LEFT JOIN?
Show answer
INNER returns only matching rows; LEFT returns all rows from the left table and NULLs where there is no match.
22
How would you improve a company's low app conversion rate?
Show answer
Map the funnel, find the biggest drop-off, check usability and load time, run A/B tests on fixes and track conversion lift.
23
What is Agile and how does Scrum work?
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Agile delivers value in small increments with feedback. Scrum organises work in sprints with planning, daily stand-ups, review and retrospective, led by a Scrum Master and Product Owner.
24
How do you validate data before analysis?
Show answer
Check row counts against the source, nulls, duplicates on keys, value ranges, date coverage and that totals reconcile with finance reports.
25
Guesstimate: how many pizzas are sold in Mumbai on a weekend?
Show answer
About 20 million people, roughly 10% order pizza on a weekend, about 1 pizza per 2 people in an order. This gives roughly 1 million pizzas, adjusted for outlets and delivery capacity.
26
What are fixed costs and variable costs?
Show answer
Fixed costs stay constant regardless of volume, such as rent; variable costs change with volume, such as raw materials.
27
What is the difference between a chart and a dashboard?
Show answer
A chart shows one view of data; a dashboard combines several charts and KPIs on one page for monitoring.
28
What is a stakeholder analysis?
Show answer
Identifying everyone affected by the project and mapping their influence and interest to decide how to communicate with and involve each group.
29
What is the difference between XLOOKUP and INDEX-MATCH?
Show answer
Both look up values flexibly; XLOOKUP is simpler with built-in not-found handling, while INDEX-MATCH works in older Excel versions.
30
Revenue grew but profit fell. Why could that happen?
Show answer
Look at the cost side: heavier discounts, higher CAC, logistics costs, product mix shifting to low-margin items, one-time expenses or pricing changes. Break contribution margin down by segment.
31
A client's profits are falling. How do you structure the problem?
Show answer
Split into revenue and cost, then revenue into price, volume and mix, and cost into fixed and variable; check internal factors and external market factors.
32
How do you write a query to find users active in consecutive months?
Show answer
Get distinct user-month pairs, self-join or use LAG on month per user, and keep rows where the previous month is exactly one month earlier.
33
A bank wants to reduce customer churn. What would you do?
Show answer
Define churn, analyse who leaves and why, segment customers, find drivers through data and surveys, design retention offers and measure uplift with a control group.
34
What are the 4 Ps of marketing?
Show answer
Product, Price, Place and Promotion, the levers a business uses to bring an offering to market.
35
What is a product backlog vs a sprint backlog?
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The product backlog is the ordered list of all desired work; the sprint backlog is the subset the team commits to in the current sprint.
36
What is a break-even point?
Show answer
The sales volume where total revenue equals total cost. It equals fixed cost divided by contribution margin per unit.
37
What is the difference between COUNT(*) and COUNT(column)?
Show answer
COUNT(*) counts all rows; COUNT(column) counts only rows where that column is not NULL.
38
How do you evaluate a marketing campaign's ROI?
Show answer
ROI = (incremental profit - campaign cost) / campaign cost. Measure incremental sales using a control group or before-after comparison.
39
What does a Business Analyst do?
Show answer
A BA bridges business and technology: gathers requirements, analyses data and processes, documents BRD/FRD and makes sure the final solution actually solves the business problem.
40
What are acceptance criteria?
Show answer
Clear, testable conditions a story must meet to be accepted, often written as Given-When-Then scenarios.
41
What is Power Pivot?
Show answer
An Excel add-in for building data models with relationships and DAX measures over millions of rows, beyond normal worksheet limits.
42
SQL: total revenue per month.
Show answer
SELECT DATE_TRUNC('month', order_date) AS month, SUM(amount) AS revenue
FROM orders GROUP BY 1 ORDER BY 1;
-- MySQL: DATE_FORMAT(order_date, '%Y-%m')
43
What is scope creep and how do you control it?
Show answer
Uncontrolled growth of requirements. Control it with a clear scope statement, change control process, impact analysis and sponsor approval for additions.
44
What is a use case diagram?
Show answer
A UML diagram showing actors and the actions (use cases) they perform with the system, giving a quick view of scope.
45
What is root cause analysis and which techniques do you know?
Show answer
Finding the underlying reason for a problem using the 5 Whys, fishbone diagrams or Pareto analysis, then fixing the cause not the symptom.
46
How do you estimate the annual revenue of a coffee shop chain?
Show answer
Number of outlets x daily customers x average bill x operating days, then validate using footfall, peak hours and similar chains.
47
What is a data table in Excel?
Show answer
A what-if tool that recalculates a formula for different inputs, for example loan payments across different rates and tenures.
48
What is a subquery and when would you use it?
Show answer
A query nested inside another, used for filtering or calculating values such as customers whose spend is above the average.
49
What is a traceability matrix?
Show answer
A table linking each requirement to design, test cases and delivery status, ensuring nothing is missed and helping assess change impact.
50
What is a BRD review and who signs it off?
Show answer
Stakeholders and the sponsor review the Business Requirements Document for completeness and accuracy, and the business owner gives formal sign-off before design begins.
51
Should a food-delivery app launch in a new city?
Show answer
Check market size (population, online ordering share), competition, restaurant supply, unit economics per order, CAC and payback period. Propose a pilot with clear success metrics.
52
BRD vs FRD?
Show answer
A BRD states what the business needs and why. An FRD details how the system should behave to meet those needs (functional specifications).
53
Explain Porter's Five Forces.
Show answer
A model assessing industry attractiveness through supplier power, buyer power, threat of new entrants, threat of substitutes and rivalry among competitors.
54
SQL: month-over-month revenue growth.
Show answer
WITH m AS (SELECT month, SUM(amount) AS rev FROM orders GROUP BY month)
SELECT month, rev,
ROUND(100.0 * (rev - LAG(rev) OVER (ORDER BY month))
/ LAG(rev) OVER (ORDER BY month), 1) AS mom_pct
FROM m;
55
How would you forecast next quarter's sales in Excel?
Show answer
Use FORECAST.ETS or a trendline on monthly history, check seasonality, compare with a simple moving average and present a range, not a single number.
56
What is the difference between OLTP and OLAP systems?
Show answer
OLTP handles many small day-to-day transactions; OLAP supports analysis over large historical data with aggregates and reporting.
57
How do you create a dashboard in Excel?
Show answer
Prepare clean data, build PivotTables and PivotCharts, add KPI cards and slicers, and arrange everything on one sheet with a clear layout.
58
What are functional and non-functional requirements?
Show answer
Functional requirements describe what the system does (login, reports); non-functional ones describe how well it does it (speed, security, availability, usability).
59
How do you find duplicate customers?
Show answer
SELECT email, COUNT(*) FROM customers GROUP BY email HAVING COUNT(*) > 1;
60
What is a SWOT analysis?
Show answer
A framework listing internal Strengths and Weaknesses and external Opportunities and Threats to assess a project or business position.
61
How do you chart a trend with a target line?
Show answer
Create a line or column chart of actuals and add the target as another series formatted as a line.
62
What is a KPI tree?
Show answer
It breaks a top metric into drivers: Revenue = Users × Conversion × AOV; Users = New + Returning, and so on. It shows which lever to pull and where a drop came from.
63
What is the difference between revenue and profit?
Show answer
Revenue is total money from sales; profit is what remains after subtracting all costs and expenses.
64
SQL: top 5 customers by spend.
Show answer
SELECT customer_id, SUM(amount) AS spend
FROM orders
GROUP BY customer_id
ORDER BY spend DESC
LIMIT 5;
65
How would you estimate the market size for an electric scooter in India?
Show answer
Top-down: two-wheeler market x EV share x addressable segment. Bottom-up: target households x adoption rate x price. Compare both for a sanity check.
66
What is the 80/20 rule in business analysis?
Show answer
Pareto principle: about 80% of outcomes come from 20% of causes, such as most revenue from a few customers or most defects from a few issues.
67
How do you use Excel's Scenario Manager?
Show answer
Define named scenarios such as best, base and worst with different input values and compare the outputs in a summary report.
68
How do you approach a guesstimate question?
Show answer
Clarify the scope, break the problem into logical parts, state assumptions with round numbers, compute step by step and sanity-check the answer.
69
How would you measure the success of a new feature?
Show answer
Define a goal metric, a baseline and guardrail metrics, run an experiment or before-after comparison and review adoption, retention and revenue impact.
70
What are aggregate functions?
Show answer
Functions that summarise rows into a value, such as COUNT, SUM, AVG, MIN and MAX.