A study was performed on gas mileage at a local automotive testing ground. The purpose of the study was to try and determine whether tire pressure, timing setting, type of oil and/or type of gas had significant effects on gas mileage. Timing settings were low and high. Types of oil were 10W30 and 10W40. Two types of gasoline were used: mid-grade and hi-test. Tire pressures were tested at levels of 30 and 34 psi.

Question

Quizplus · Accepted Answer

The Answer is a. What is the response variable?
Gas mileage
b. What are the factors?
Timing, Oil, Gas, Pressure
c. What are the levels of the factors? Put these into a table.

\begin{array} { l c l } & ext { Level 1 } & ext { Level 2 } \ ext { Timing } & ext { Low } & ext { High } \ ext { Oil } & 10 w 30 & 10 w 40 \ ext { Gas } & ext { Mid-grade } & ext { High test } \ ext { Pressure } & 30 & 34\end{array}

d. Describe a treatment condition.
A treatment condition is a single experiment for instance: L, 10w30, Mid-grade, 30 psi.
e. How many different experiments would need to be run to cover all of the permutations? How did you arrive at that figure?
2x2x2x2 = 16

A Study Was Performed on Gas Mileage at a Local