thanks to Jo Morgan for pointing it out
a ppt is here
[stem and leaf diagrams/display/plots/charts]
all of the digits, from 0 to 9, must be used (i.e. once only)
Showing posts with label stem and leaf diagrams. Show all posts
Showing posts with label stem and leaf diagrams. Show all posts
Wednesday, 16 October 2019
stem and leaf diagram problems
this idea is from MathsPad, Nicola Waddilove and James Pearce
thanks to Jo Morgan for pointing it out
a ppt is here
[stem and leaf diagrams/display/plots/charts]
all of the digits, from 0 to 9, must be used (i.e. once only)
thanks to Jo Morgan for pointing it out
a ppt is here
[stem and leaf diagrams/display/plots/charts]
all of the digits, from 0 to 9, must be used (i.e. once only)
Thursday, 11 May 2017
Saturday, 21 January 2012
comparing two data sets
the longevity of US Presidents has interesting features
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
the data sets
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:
little point in estimating the means - just to practise this technique
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:
Monday, 29 August 2011
tomato plant heights
a ppt is here
Sunday, 3 April 2011
hold your breath
various statistical surveys suggest that children can hold their breath for up to and slightly beyond a minute
that makes it a good experiment for a classroom task on representing data
have a large clock (digital display preferably) available
ask students to take a deep breath, hold their nose and hold their breath for as long as they can
after one exhalation at the end, they note their time on a small wipe-board
at one school they get students to come out with their boards and get into groups according to the decade numbers (in seconds)
they then arrange themselves - so that an ordered stem and leaf plot is produced physically
as an alternative to breath holding, students could work in groups to see how long they can stand on one leg when they are blindfolded (or have their eyes shut - the 'blind stork' test)
again a minute is usually the most that people manage
they could compare standing on their right and left legs, possibly producing a scatter graph or a back-to-back stem and leaf diagram from the two data sets
that makes it a good experiment for a classroom task on representing data
ask students to take a deep breath, hold their nose and hold their breath for as long as they can
after one exhalation at the end, they note their time on a small wipe-board
at one school they get students to come out with their boards and get into groups according to the decade numbers (in seconds)
they then arrange themselves - so that an ordered stem and leaf plot is produced physically
as an alternative to breath holding, students could work in groups to see how long they can stand on one leg when they are blindfolded (or have their eyes shut - the 'blind stork' test)
again a minute is usually the most that people manage
they could compare standing on their right and left legs, possibly producing a scatter graph or a back-to-back stem and leaf diagram from the two data sets
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