median
don steward
mathematics teaching 10 ~ 16

Friday, 29 April 2011

scatter and correlation

although there is value in plotting scatter graphs by hand, there is also value in using a spreadsheet to automatically draw a line of best fit and give its equation

people argue, generally rightly, that ICT can free up time to consider interpretations, evaluations and other analyses

using ICT, questions can be reversed: students could be asked to generate data sets with particular correlations

the correlations for these data sets are
0
- 0.3
0.5
-0.7
0.9
-0.99







students could be asked to guess these,
following an understanding that the coefficient varies between -1 and +1:






















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