Statistics activity
ANU

 Activity: interpreting some basic statistics
Forest Measurement and Modelling.


Consider the following list of tree height data obtained from a stand of Eucalyptus trees, and then try the quiz below. (Data in rtf file)

13.8, 13.8, 14.4, 12.8, 12.8, 12.9, 14.5, 14.5, 14, 14, 13.1, 12.7, 16.1, 15.6, 14.8, 14.9, 16.9, 16.3, 17.2, 14, 15, 15.4, 14.4, 14.4, 14.2, 14.2, 14.1, 15.2, 14, 14.2, 15, 14.4, 13, 12.2, 13.5, 12.9, 14, 15, 13, 13, 13.5, 16, 14.3, 15.7, 14.9, 16, 17.1, 16.5, 17, 14.5, 14, 14.3, 14.5, 14.8, 14, 14, 15.5, 15.2, 15

Try this quick quiz:

Calculate and compare the mean and the median for the above data. Do these statistics suggest the distribution of normal?

 Yes
No
Find the minimum and maximum values in the list, and using this data plus the assumption that the distribution is normal, estimate the standard deviationof the list:

 Less than 0.25
0.25 - 0.75
0.75 - 1.25
1.25 - 1.75
More than 1.75

[stats.htm] Revision: 6/2000
Cris.Brack@anu.edu.au