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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.
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.
Interactive engagement (clicker) questions: Confidence intervals for means
Topics:
• Confidence intervals – One sample mean – t
• Confidence intervals – One sample mean – z
• Confidence intervals – Concepts – Sample size
• Confidence intervals – Concepts – Standard error

Interactive engagement (clicker) questions: Hypothesis testing for means
Topics:
• Hypothesis tests – One sample / paired – One sample mean - t
• Hypothesis tests – One sample / paired – One sample mean - z
• Hypothesis tests – Concepts – P-value and significance level
• Hypothesis tests – Type I / type II errors and power