Independent variables
>The stickiness of the Blu-Tack eg New Blu-Tack, reusing Blu-Tack
>The temperature
>The surface the poster is stuck on eg rough, smooth
Dependent variable
>How long the poster will stay up for
Controlled variables
> The size of the Blu-Tack
>The time that the poster is put up
>Size of the paper
Just be a bit more careful with your variables- what you seem to think are your independent variables are in fact ones you need to control!
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