* Simple: The experimental variable in our study was the amount of fertilizer applied to the plants.
* Elaborating on the impact: By manipulating the experimental variable, we observed a significant increase in plant growth.
* Highlighting control: We kept all other factors constant except for the experimental variable to ensure its influence was isolated.
* Research context: The experimental variable in this psychology experiment was the type of music played during the memory task.
* Comparing: The experimental variable was the brand of toothpaste, which we compared to see which had the best whitening results.
Remember that the "experimental variable" is the factor you are manipulating or changing in your experiment to see its effect on the outcome.