Cleaning the Death Star After dealing with a group of bounty hunters, Grand Moff Tarkin notices that some of the meeting rooms in the Death Star have a horrible smell. His head scientist tells him that gas from the planet Yavin will get rid of the smell. Tarkin decides to test this out by spraying half of the meeting rooms with Yavin gas. He sprays the other half of the rooms with water. After 3 days of treatment there is no change in the smell of the rooms. 1. What was the problem Tarkin 3. What is the dependent variable? wanted to investigate? 4. What should Tarkin's conclusion be? 2. What is the independent variable? plz help!