Answer: Type of magnet -> Controllable, Temperature -> Independent, Pins -> Dependable
Step-by-step explanation:
This is easier to understand if you think how an experiment is crafted:
- You need to make sure the elements are somehow the same so you can't have results because of an external variable you were not controlling. In this case, what you are clearly controlling before the experiment is the type of magnet, making sure they are all identical and they don't catch more or less pins because they are big or small.
- Then there is the experiment itself - does temperature affect magnets capabilities? In every experiment there is one thing that you control but change - independent variable. Its not something that the results can change, its something you do. In this case, you put magnets through different temperatures.
- And last, there is the outcome of all this: how many pins they catch. This is the dependable variable, the one that is going to change because of the changes on the independent variable and that you want to observe and note. Sometimes you may already have suspicions (hypothesis) but either way the final result is not something you change yourself.
I hope this was useful!