Me with this 60 points,5-star rating, an and marked as branliest.

robert was told by a friend that if you place unused batteries in a refrigerator, they would last longer. he wanted to see is this was true. he hypothesized that if the temperature is colder, then the battery power would last longer. robert brought some batteries. he placed 1 of them in the refrigerator,1 on his desk, and 1 on a heating pod. one week later, robert tested 3 batteries with a battery tester. he repeated the test 3 more times for a total of 4 weeks. he used the same size batteries.

independed variable:

dependent variable:

constants:

control: