HCLTech Business Analytics Interview Questions & Answers

Uncontrolled growth of requirements. Control it with a clear scope statement, change control process, impact analysis and sponsor approval for additions.

Aggregate revenue per month and use LAG(revenue) OVER (ORDER BY month) to compute (revenue - previous) / previous.

Reconcile totals with source tables using SQL, check filters and joins for duplication, compare with prior periods and verify with business owners.

Stakeholders and the sponsor review the Business Requirements Document for completeness and accuracy, and the business owner gives formal sign-off before design begins.

Assess market size and demand, customer need, competition, unit economics, capabilities, risks and strategic fit, then test with a pilot before scale-up.

Every KPI is a metric, but a KPI is tied directly to a strategic goal (e.g. monthly churn). A metric can be any measurement (e.g. page views).

INNER returns only matching rows; LEFT returns all rows from the left table and NULLs where there is no match.

Functional requirements describe what the system does (login, reports); non-functional ones describe how well it does it (speed, security, availability, usability).

Define named scenarios such as best, base and worst with different input values and compare the outputs in a summary report.

The sales volume where total revenue equals total cost. It equals fixed cost divided by contribution margin per unit.

Create a table, insert a PivotTable, drag region to rows, product to columns, sales to values, and add slicers for month or channel.

A query nested inside another, used for filtering or calculating values such as customers whose spend is above the average.

Fixed costs stay constant regardless of volume, such as rent; variable costs change with volume, such as raw materials.

Functions that summarise rows into a value, such as COUNT, SUM, AVG, MIN and MAX.

Identifying everyone affected by the project and mapping their influence and interest to decide how to communicate with and involve each group.

Finding the underlying reason for a problem using the 5 Whys, fishbone diagrams or Pareto analysis, then fixing the cause not the symptom.

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.

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.

Top-down: NCR population aged 18–30 × share of graduates × share wanting paid upskilling × average fee. Cross-check bottom-up with institutes × batches × students × fees. State your assumptions.

CAGR = (End value / Start value)^(1/years) - 1, entered as =(B2/A2)^(1/n)-1.

Interviews, workshops, surveys, observation, document analysis, prototyping and brainstorming, chosen according to stakeholders and project stage.

A table linking each requirement to design, test cases and delivery status, ensuring nothing is missed and helping assess change impact.

A what-if tool that recalculates a formula for different inputs, for example loan payments across different rates and tenures.

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.

A short requirement written as 'As a user, I want X so that Y', backed by acceptance criteria. Good stories follow INVEST: independent, negotiable, valuable, estimable, small and testable.

Use STAR: Situation, Task, Action, Result. Show that you listened, found the underlying goal, used data to align people and reached a documented decision.

OLTP handles many small day-to-day transactions; OLAP supports analysis over large historical data with aggregates and reporting.

Testing how changes in key inputs such as price or volume affect the output, in Excel using data tables or scenario manager.

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.

Profit = Revenue minus Cost, where revenue = price x volume and cost = fixed + variable. Split each part to find which one explains a change.

Excel suits small to medium data and quick ad-hoc work; SQL queries large databases directly and repeatably.

The smallest version of a product with enough features to deliver value and gather real user feedback before investing more.

Product, Price, Place and Promotion, the levers a business uses to bring an offering to market.

A diagram of steps, decisions and owners in a process, made using BPMN or flowcharts in tools like Visio, Lucidchart or draw.io.

Prepare clean data, build PivotTables and PivotCharts, add KPI cards and slicers, and arrange everything on one sheet with a clear layout.

An early assessment of whether a proposed solution is technically, economically, operationally and legally viable before committing budget.

Map the funnel, find the biggest drop-off, check usability and load time, run A/B tests on fixes and track conversion lift.

GROUP BY aggregates rows by column; WHERE filters before grouping and HAVING filters after, using aggregate conditions.

Define a goal metric, a baseline and guardrail metrics, run an experiment or before-after comparison and review adoption, retention and revenue impact.

Clarify the underlying goals, present data and trade-offs, facilitate a joint session, escalate to the sponsor if needed and document the agreed decision.

A measurable value showing progress to a goal, such as conversion rate, average order value, cart abandonment rate and customer retention.

Check data accuracy, then segment by city, restaurant, time and user type; look at supply, delivery time, pricing, competitors and seasonality before proposing fixes.

Anyone affected by or influencing the project: sponsors, product owners, end users, developers, testers, operations and customers.

A framework listing internal Strengths and Weaknesses and external Opportunities and Threats to assess a project or business position.

A column or set of columns that uniquely identifies each row in a table and cannot contain NULL.

AVG ignores NULLs; use COALESCE(col, 0) if NULLs should count as zero, depending on the business meaning.

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.

Strengths and Weaknesses are internal; Opportunities and Threats are external. Example: S = strong faculty, W = low brand awareness, O = AI upskilling demand, T = free online content.

A model assessing industry attractiveness through supplier power, buyer power, threat of new entrants, threat of substitutes and rivalry among competitors.

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.

As a customer, I want to reset my password by email so that I can get back into my account. Acceptance criteria: • Reset link expires in 15 minutes • Password rules are shown while typing • A success message appears after reset

Create a line or column chart of actuals and add the target as another series formatted as a line.

Both look up values flexibly; XLOOKUP is simpler with built-in not-found handling, while INDEX-MATCH works in older Excel versions.

ROI = (incremental profit - campaign cost) / campaign cost. Measure incremental sales using a control group or before-after comparison.

The total profit expected from a customer over the relationship, roughly average margin x purchase frequency x lifespan, compared with acquisition cost.

Decide whether and how to enter a market by evaluating attractiveness, competition, capabilities and entry mode (build, buy, partner), then risks and next steps.

A model classifying features as basic, performance or delight attributes based on how they affect customer satisfaction, helping decide what to build first.

It returns a custom value when a formula errors out, keeping reports clean, for example =IFERROR(VLOOKUP(...), "Not found").

Use tables, Power Query, remove volatile functions, filter before calculating and move to Power Pivot or a database when rows reach the millions.

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.

A BRD states what the business needs and why. An FRD details how the system should behave to meet those needs (functional specifications).

A chart shows one view of data; a dashboard combines several charts and KPIs on one page for monitoring.

Review > Protect Sheet or Workbook with a password, lock cells, hide formulas and allow only selected cells to be edited.

A language for querying databases. BAs use it to pull data themselves, validate numbers, check reports and answer questions without waiting for engineers.

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.

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.

COUNT(*) counts all rows; COUNT(column) counts only rows where that column is not NULL.

Clear, testable conditions a story must meet to be accepted, often written as Given-When-Then scenarios.

SUM(sales) per category divided by SUM(SUM(sales)) OVER () and multiplied by 100 gives each category's share of the total.

Goal Seek (find the input for a target output), Data Tables (see outputs for many inputs) and Scenario Manager (save best, base and worst cases).

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;

An Excel add-in for building data models with relationships and DAX measures over millions of rows, beyond normal worksheet limits.

Log the change, assess impact on scope, cost and timeline, get approval through change control or backlog grooming, and update documents and stakeholders.

Separate inputs, calculations and outputs, link all formulas to input cells, add scenarios and checks, and avoid hard-coded numbers inside formulas.