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I know that the above question is broad, but I specifically want an answer in terms of the following investigation - all of question 3 (ONLY) of this paper.

The independent variable, according to this mark scheme is the presence of hidden food in the cage to which the rats are released. How am I to identify this if it's not stated that the investigation investigates the ability to learn with the presence of hidden food.

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closed as unclear what you're asking by James, fileunderwater, AliceD, another 'Homo sapien', Rory M Mar 22 '17 at 19:15

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Please include the question from the external site. There are good reasons to do this. The main one is: once the link breaks, your question is worthless. I'm voting to close this question as unclear because even though I have read the exam question and helped to edit the previous version of this question, you still do not have a specific question. Are you asking "what is an independent variable"? I sympathise with your question. It's a poor exam question in my opinion. $\endgroup$ – James Mar 22 '17 at 7:38
  • $\begingroup$ @James, it does indeed indicate that. The exam question claims that the difference in the percentage of mice in group P and Q who found food in the second experiment was due to the fact that the group P mice had to look for food when they were released the into the cage the first time around. In the first version of the question, I had completely missed the fact that there IS indeed an independent variable in this question. I deleted the other question. I am absolutely baffledas to how one can note the independent variable in this investigation when the question does not state it at all. $\endgroup$ – Mathematician Mar 22 '17 at 23:50
  • $\begingroup$ Yet, we seem to be required to notice such an independent variable. How? That's my new question, and it's completely different from the previous one. Does that make the question more specific? :) $\endgroup$ – Mathematician Mar 22 '17 at 23:51