# Experiment Design Analysis - Gas Mileage

Marcia heard that premium unleaded gasoline gives her better gas mileage than regular unleaded. In her experiment, she filled up with tank # 1 right before she drove to Seattle. With tanks 2, 3 and 4 Marcia drove to school and work in Oak Harbor.

- 1
^{st}tank : premium yields 22 mpg - 2
^{nd}tank : premium yields 20 mpg - 3
^{rd}tank : regular yields 20 mpg - 4
^{th}tank : regular yields 19 mpg

- Question/Problem:

- Hypothesis with a prediction:

- Manipulated variable:

- Levels of treatments:

- Responding variable:

- Controlled variable:

- How would you improve this experiment?

- Why did Marcia uses two tanks for each gasoline type?