I was reading a definition of "experiment" in science to be used in a
lecture and the use of treatments and controls are an important feature of
an experiment but.... my doubt is... is it possible to plan an experiment
without a control and call this as an "experiment" ?
For example, in a polluted river basin there is a gradient of contamination
and someone are interested in to compare the fish diversity in ten rivers of
this basin. Then, the "pollution level" are the treatment (with ten levels)
but if there is not a clean river in the basin, I cannot use a control !
Is this an experiment anyway ?
Thanks for any comments.....
Prof. J. C. VOLTOLINI
Grupo de Estudos em Ecologia de Mamiferos - ECOMAM
Universidade de Taubate (UNITAU)
Departamento de Biologia
Taubate, SP, Brasil. CEP 12030-010
Tel: 0XX12-2254165 (lab.), 2254277 (secret. depto.)
FAX: 12 - 2322947
E-Mail: [log in to unmask]