median
don steward
mathematics teaching 10 ~ 16

Saturday, 21 January 2012

comparing two data sets

the longevity of US Presidents has interesting features

many students will sensibly assert that more recent Presidents lived to an older age on average due to advances in health care, nutrition and other factors that have led to a significant increase in life expectancy

some Presidents in this data set are not counted (but could be) - just to keep the sizes of the data sets the same (with apologies) for a frequency graph comparison


















a possible question to direct the study:








the data sets:





















the analysis could use some of the following techniques (which are overlapping in terms of what they tell you):








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