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Sampling & Sample variability Review of calculate Sample Statistics & making Box plots Sample Variability  how each sample varies from other samples (but is similar) iNZight VIT on sampling demonstration Sampling error notes (link to mathstatsfacilitators website) To Achieve you MUST discuss sample variability, including the variability of the population estimates. An understanding relating to sampling variability and variability of estimates must be evident. Another sample will give different medians and informal confidence intervals. 
Video Chris Wilds overview of sample variation, bootstrapping & randomisation Add in iNZight VIT on sample variation Qualifications & Work Data Cards:

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Sample Size Activity: take sample from a population (data cards) manipulate, make box plots, compare with rest of class, increase sample size The effect of Sample size: on sample variability, box plots and representation of the population Samples of size n = 11 What sample size is most apppropriate? Increasing the sample size increases the cost of the survey. As long as the sampling method is sound there is very little benefit in increasing the sample size above 35. We would get little extra useful information.

Video Chris Wilds overview of sample variation, bootstrapping & randomisation Links to Census at school Animations page

"An investigator only gets to see one frame of the movie"What happens if we change the sample size? 

A Sample size n = 15 
A Sample size n = 60 

Links to Census at school Animations page 

Sample size n = 10 animation
Sample size n = 100 animation
Sample size n = 1000 animation



More animations like this at Census at school Animations page 
