The independent variable is the oven temperature (350 degrees or a higher temperature set by Robin), as this is what Robin can control and manipulate.
The dependent variable is the time it takes for the cake to bake, as this will be influenced by the oven temperature set by Robin.
Robin is baking a cake for the first time. Even though the box says to set the oven to 350 degrees, robin is thinking that the higher the temperature, the faster the cake will bake identified the dependent and the independent variables
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