I'm performing a Winogradsky Column lab and I have one column with a layer of eggshell incorporated, but the other does not. Both columns do, however, have constany exposure to sunlight. Thus, I'm assuming that the column without the eggshell layer will not change.
2007-04-04 05:19:15 · 2 answers · asked by brandys_peep 2 in Science & Mathematics ➔ Biology
Depends...there is your negative control and your positive control. Your negative control should be the one that does not change (otherwise your experiment has been contaminated in some way). Your positive control should be the one that does change and you should know what that change should be.
2007-04-04 17:27:39 · answer #1 · answered by dissaffected01 2 · 0⤊ 0⤋
The "control" group in a study is the one that does not recieve treatment or does not get the variable factor. In your case that would be the group that does not have the eggshell layer. If the "control" group does change that would indicate another possible variable exists or the treatment, the eggshell layer is not effective. The better assumption would be taht the"control" group should not change.
2007-04-04 05:29:17 · answer #2 · answered by fangtaiyang 7 · 0⤊ 0⤋