You are working with the text-only light edition of "H.Lohninger: Teach/Me Data Analysis, Springer-Verlag, Berlin-New York-Tokyo, 1999. ISBN 3-540-14743-8". Click here for further information.
| You are working with the text-only light edition of "H.Lohninger: Teach/Me Data Analysis, Springer-Verlag, Berlin-New York-Tokyo, 1999. ISBN 3-540-14743-8". Click here for further information.
|
Table of Contents  Appendix Exercises Strontium in Drinking Water |
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| See also: two-sample t-test, survey of exercises |   |
Measuring the concentration of strontium in drinking water in two different
areas resulted in the following values:
| Area 1 (20 sites)
concentrations in mg/l |
Area 2 (18 sites)
concentrations in mg/l |
| 2.88 2.22 0.80 2.60
3.80
5.50 5.60 2.30 4.40 0.71 0.91 0.13 3.88 3.20 4.90 5.12 2.11 0.80 0.90 1.22 |
5.54 4.99 4.31 3.52
3.28
4.20 2.33 5.80 3.03 3.77 3.81 2.65 2.36 2.05 2.47 4.22 4.89 3.17 |
Is there any significant difference in the strontium concentration between
areas 1 and 2? Try to find an answer with an error probability of
1 % and 5 %. Go to the 
in order to perform the necessary tests (the strontium data will be loaded
automatically).
Last Update: 2005-Jul-16