Year or day as manipulated variable

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Can we use years or days as manipulated variable in an experiment.

For example:
The table below shown the number of turtle left from year 2000-2005.

year | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 |
the number of turtle left 500 450 400 350 300 250

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Hi moghaz76,

Yes, years (time in general) is fine to use as the manipulated (independent) variable.

Here's some more information about variables that you might find useful:
https://www.sciencebuddies.org/science- ... bles.shtml

Since you are in high school, our regular and Advanced Project Guides might also be useful to you:

Regular Guide:
https://www.sciencebuddies.org/science- ... ndex.shtml

Advanced Guide:
https://www.sciencebuddies.org/science- ... ndex.shtml

Let us know if you have more questions!