Reference no: EM131403306
For the fleet described in given Exercise,
a. Construct a simple tabulation in which the counts are according to the type of transmission.
b. Construct a cross-tabulation describing the fleet, using type of transmission and whether the vehicle has air conditioning as the categorization variables.
c. Construct a display showing the average mpg according to type of transmission and whether the vehicle has air conditioning. Do the categorization variables seem to be related to mpg? If so, how?
Exercise
The 30 vehicles operated by a taxi service have been listed according to their engine (1 = diesel, 2 = gasoline), transmission (1 = manual, 2 = automatic), and whether they have air conditioning (1 no air conditioning, 2 = air conditioning). These characteristics, along with the miles per gallon (mpg) achieved by each vehicle during the past month, are listed here. The data are also provided in file XR02048.
a. Construct a simple tabulation in which the counts are according to the type of engine.
b. Construct a cross-tabulation describing the fleet, using type of engine and type of transmission as the categorization variables.
c. Construct a display showing the average mpg according to type of engine and type of transmission. Do the categorization variables seem to be related to mpg? If so, how?
|
Engine
|
Trans
|
AC
|
mpg
|
Engine
|
Trans
|
AC
|
mpg
|
|
1
|
1
|
1
|
36.4
|
1
|
1
|
2
|
38.6
|
|
1
|
1
|
1
|
37.7
|
1
|
1
|
2
|
34.8
|
|
1
|
1
|
1
|
38.2
|
1
|
2
|
2
|
30.8
|
|
1
|
1
|
1
|
41.8
|
1
|
2
|
2
|
26.4
|
|
1
|
1
|
1
|
34.8
|
1
|
2
|
2
|
31.6
|
|
1
|
2
|
1
|
35.4
|
1
|
2
|
2
|
28.3
|
|
1
|
2
|
1
|
31.3
|
1
|
2
|
2
|
29.5
|
|
1
|
2
|
1
|
32.2
|
2
|
1
|
2
|
23.0
|
|
2
|
1
|
1
|
26.2
|
2
|
1
|
2
|
21.5
|
|
2
|
1
|
1
|
25.5
|
2
|
1
|
2
|
19.5
|
|
2
|
1
|
1
|
27.7
|
2
|
2
|
2
|
18.3
|
|
2
|
2
|
1
|
22.0
|
2
|
2
|
2
|
19.1
|
|
2
|
2
|
1
|
23.3
|
2
|
2
|
2
|
20.8
|
|
1
|
1
|
2
|
34.8
|
2
|
2
|
2
|
21.8
|
|
1
|
1
|
2
|
34.0
|
2
|
2
|
2
|
18.4
|
|
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