Question

1. investigators want to see if the temperature at which a battery is stored affects how long it works in a flashlight. they use 12 aa batteries. they place 4 batteries in the freezer for 1 hour, 4 batteries in the refrigerator for 1 hour and 4 batteries they leave at room temperature for an hour. then they measure the amount of time the battery lasts in the flashlight before it runs out.

independent variable:

dependent variable:

controlled variable:

controlled variable:

hypothesis:

Explanation:

The independent variable is what the experimenter changes. Here, it's the storage - temperature of the batteries. The dependent variable is what is measured as a result of the change in the independent variable, which is the battery - life in the flashlight. Controlled variables are factors kept the same throughout the experiment, such as the type of battery and the time of storage. A hypothesis is a proposed explanation.

Answer:

Independent Variable: Temperature at which the battery is stored
Dependent Variable: Amount of time the battery lasts in the flashlight
Controlled Variable: Type of battery (AA)
Controlled Variable: Time of storage (1 hour)
Hypothesis: If the temperature at which a battery is stored is lower, then the amount of time it lasts in a flashlight will be shorter.