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ZIMSEC A-Level Statistics

6.7.1Sampling techniques and estimation of population parameters

Sampling techniques and estimation of population parameters in ZIMSEC A-Level Statistics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic41 practice questions2 lessons

Overview

Form 5.

Learning objectives

What the syllabus expects you to be able to do.

  1. 6.7.1.1Form 5: distinguish between a sample and a population and between probability and non-probability sampling techniques.
  2. 6.7.1.2Form 5: apply sampling methods to identify representative samples.
  3. 6.7.1.3Form 5: calculate the sample mean, variance and standard deviation and unbiased estimates of population parameters.

Lessons

  • Populations, samples and sampling methods

    40 min

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  • Unbiased estimates of the population mean and variance

    40 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Sampling techniques and estimation of population parameters: sample question

1 mark

The masses, in kg, of five randomly chosen pockets of potatoes are 12.4, 13.1, 11.8, 12.9 and 13.6. Find an unbiased estimate of the population variance, correct to 3 significant figures.

Only if the answer has a unit, e.g. cm or km/h.

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