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Sample variability Overview of population concepts: mean & standard deviation, and distribution Video Chris Wilds overview of sample variation etc, time 0:00 to 7:23 Sample Variability  how each sample varies from other samples (but is similar) The effect of Sample size 'n' on sample variability, box plots and representation of the population. Use iNZight 'Sampling Variation' tool to present the concepts using the dolphin data set. In your report: 2. (Should Do) 3. (Could do) 
Class notes,Class notes Activity: take sample from a population (data cards) manipulate, make box plots, compare with rest of class, increase sample size Links to Census at school Animations page

Key Concepts A population has (usually) unknown Take a sample eg size n = 9 The sampling process should ensure the sample represents the population Calculate sample statistics Make a box plot Compare your box plot with other samples What might the population median be? We could use out sample median as an estimate, but we have a problem… 


Sample: 

Max = Upper Quartile = Median = Lower Quartile = Minimum = 

"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 
