Bill wants to figure out what type of battery works best He buys Brand A...
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Bill wants to figure out what type of battery works best He buys Brand A Brand Brand B and Brand C He gets three identical light bulbs and hooks the batteries up to them After this he puts them in the dishwasher for 20 minutes He keeps track of the bulbs until they burn out Bulb A burns out after 6 hours Bulb B burns out after 6 5 hours and Bulb C burns out after 8 hours What is the independent variable in the following experiment How long the battery lasts Brand of battery O The type of light bulb O The stores at which Bill bought the batteries
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