a powerpoint is here
many students will sensibly think 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 (general) increase in life expectancy
some Presidents in this data set are not counted (but could be)
this is 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 analysis could use some of the following techniques
which are overlapping in terms of what they tell you:
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