Exam CS1

CS1 practice questions

Original questions in the style of both papers, sorted by syllabus area, each with hints, a worked solution and a marking schedule.

Paper A3 hours 20 minutes, a theory paper answered in Word
Paper B1 hour 50 minutes, questions answered in R, results presented in Word

Past papers

Past papers and examiners' reports moved to the members' learning site on 15 October 2025. Non-members can ask for guest access. The questions here are original and add to them rather than copy them.

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Aims and stages of an analysis

Paper A style · Data analysis · Straightforward · 9 marks

A general insurer's analytics team has been asked to carry out three pieces of work using its motor portfolio data:

(a) summarising the average claim cost in each region last year for the annual report;

(b) using a random sample of 2,000 policies to assess whether the claim frequency of drivers aged under 25 differs from that of older drivers across the whole portfolio, with a measure of the uncertainty;

(c) forecasting the number of claims the insurer will receive next quarter.

  1. (i)

    State, with a reason, whether each of (a), (b) and (c) has a descriptive, an inferential or a predictive aim.

    3 marks
  2. (ii)

    Describe the main stages the team should follow to carry out piece of work (c), from defining the problem to reporting the results.

    4 marks
  3. (iii)

    Suggest two tools or techniques the team could use in the exploratory stage of piece of work (a), and say what each would show.

    2 marks

Next step

The CS1 subject page

Questions people ask

Do I need statistical tables?

Paper A questions here give every critical value they need. In Paper B questions you use R for probabilities and quantiles, as in the exam.