Q1) Martin Motors has in stock three cars of same make and model. President would like to compare gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. For each trial, gallon of gasoline was added to the empty tank, and car was driven until it ran out of gas. Following table illustrates the number of miles driven in each trial.
|
Types of Gasoline
|
Distance (miles)
|
|
Car A
|
Car B
|
Car C
|
|
Regular
|
22.4
|
20.8
|
21.5
|
|
Super regular
|
17.0
|
19.4
|
20.7
|
|
Unleaded
|
19.2
|
20.2
|
21.2
|
|
Premium unleaded
|
20.3
|
18.6
|
20.4
|
Using.05 level of significance:
a) Is there difference among kinds of gasoline?
b) Is there difference in the cars?