Mathematics · OCR H240 · Topic LDS

The large data set

A real data set provided by the exam board. Questions assume you have explored it in lessons.

  • 1 sub-topic
  • Taught in Year 13
  • 2 practice questions
  • 1 animated lesson
Practice questions (2) Lessons Worksheets coming soon All OCR Mathematics topics

What the specification says

Every sub-topic OCR can examine in this topic, with its reference number from the official specification. The Y12 and Y13 tags show when each sub-topic is usually taught.

  1. LDSFamiliarity with the OCR large data setY13

Try 2 questions

Easy and medium questions from this topic, each with a worked solutions and the mark for every step.

The large data set

Easy

Large data set: sampling · Year 12 · 2 marks

  1. Describe how to take a systematic sample of 15 days from 184 days of data.
    (2)
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  1. 184÷15≈12184 \div 15 \approx 12: choose every 12th day.
  2. Start at a random day between 1 and 12.

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The large data set

Medium

Working with the large data set · Year 12 · 2 marks

  1. Explain one advantage of using the large data set when testing a hypothesis about a variable, and one issue you might meet in the data.
    (2)
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  1. It gives a large, real sample, so conclusions are more reliable.
  2. Missing values or entries such as 'tr′' or 'n/a′n/a' need cleaning.

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