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You accidentally left a carton of milk on the counter all night. you notice that the milk tastes sour compared to the way it tastes when it is stored in the refrigerator overnight. 1. is this observation testable? 2. determine whether the observation is qualitative or quantitative. 3. write a hypothesis and null hypothesis. 4. what are the independent and dependent variables? 5. what are the controls (both positive and negative)?
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