Age 16 to 18 Challenge Level:
These questions are not necessarily designed to have a 'right' or
'wrong' answer -- there are various shades of grey. The purpose is
to get you thinking about the statistics involved. You can do this
at any level of statistics (ignore any parts which seem too
Can you think of concrete
examples (which may or may not be simple) where the
statements in the questions do or do not happen?