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Interactive engagement (clicker) questions: Sampling distributions of means

Sample Question

Suppose that we are to draw many random samples of 120 employees from a large company. The average of the hourly wages of the 120 employees is computed for each sample. Below is the sampling distribution of the average values from the repeated samples.

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Prerequisite knowledge

Students should:

  • be able to recognize probability models as distributions with shape, centre, and spread
  • be able to recall key properties of the Normal model
  • be able to distinguish between a population and a sample, and between parameters and statistics

Learning Objectives

  • Identify the population, sample, parameters and statistics in a given scenario
  • Recall the sampling distribution of the mean of a sample from a Normal distribution
  • Describe properties of the sampling distribution of the sample mean in general situations, using the Central Limit Theorem
  • For the sample mean, explain whether and how the population distribution and the sample size influence the sampling distribution of the sample mean
  • Apply the Central Limit Theorem to problems involving averages of variables from arbitrary distributions

Suggested use(s) and tips

These resources are intended to be used in a number of ways:

  • as stand-alone clicker questions during lectures;
  • as assessment questions during and outside of class (e.g., pre-lecture quiz after students complete pre-lecture reading or other assigned tasks);
  • as questions to be adapted for use in guided in-class activities or other instructor-supplied material

About this resource

Funding: University of British Columbia
Project Leader: Eugenia Yu
Thanks To: Nancy Heckman, Bruce Dunham, Melissa Lee, Gaitri Yapa, Mike Whitlock, Fred Cutler, Diana Whistler, Andrew Owen, Mike Marin, Leslie Burkholder, Doug Bonn, the UBC Flex Stats initiative for numerous suggestions and improvements.

Tags

Topics:
• Probability -- Laws, theory -- Central Limit Theorem
• Sampling distributions -- Sample mean

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