Introduction
The file offered here is Statistics Paper I from the 2009 UPSC Civil Services Mains. It was issued in English and Hindi, and our archived copy preserves it as released. There is no page count in our record, so look at the PDF before planning a sitting. It is the 2009 counterpart of the Statistics Paper I from 2010 that sits on its own page.
Reference data
| Item | Value |
|---|---|
| Exam | UPSC Civil Services Main |
| Cycle | 2009 |
| Optional | Statistics, Paper I |
| Medium | English and Hindi |
| Key | None |
The reader it suits
Statistics optional candidates often have training in mathematics, economics or data science, and they know the maths already. What they need is to understand how it is packaged for an exam. Reading the 2009 questions along with the 2010 ones allows comparison across two years, which is a tiny but valuable trend sample.
Steps for a good practice session
- Set a timer matching the paper’s duration and keep your phone away.
- Attempt questions in order of confidence, not in printed order.
- Do not stop for a formula check; mark the question and move on.
- After the sitting, redo flagged questions with books open.
What Paper I usually covers
The first paper of the optional is built around probability, probability distributions, statistical inference, and linear models, together with sampling and design ideas. Use the paper to see whether the emphasis is on proofs, on numerical work, or on interpretation of results.
Mistakes to look for in your own work
- Applying a test without stating its assumptions.
- Arithmetic errors in mean and variance calculations.
- Leaving out the conclusion in plain words after a test statistic.
Comparing years
Make a two column sheet of topics for 2009 and 2010. Where both years test the same area, it earns a place on your must-revise list. Where only one does, note it as a possible swing topic.
Stay calm with long sums
If a calculation grows messy, pause and check that the set-up is right before pressing on. A correct method with a small arithmetic slip loses far fewer marks than a tangled approach.
Printed support
Competer sells printed UPSC material for those who prefer solving on paper. Keep this paper and your notes together in one binder.
