A2 Data and their limitations Activities & Weblinks
The following activities develop ideas about data.
These ideas are also referred to in other activities.
Notes on the meaning of Reliability, Validity and Accuracy from BEEP http://www.beep.ac.uk/content/573.0.html.
Explanation of random and systematic errors in physical measurements
Explanation of random and systematic errors in social research
Mean, median, mode and spread of data. Sampling
A useful guide on how to read statistics for journalists, with explanations of things like standard deviation and margin of error.
Very basic reminder on meaning of mean, median and mode from BBC
Explanation of measures of dispersion, range, interquartile range and standard deviation from the Open University
A useful glossary of statistical terms
Presentation and analysis
An explanation of box and whisker plots from an Open University course.
Another explanation of interquartile range and box and whisker plots
Some advice on the used of charts and graphs for health statistics.
An explanation of the scale on a log graph