Pressure Mileage
1        30    29.5
2        30    30.2
3        31    32.1
4        31    34.5
5        32    36.3
6        32    35.0
7        33    38.2
8        33    37.6
9        34    37.7
10       34    36.1
11       35    33.6
12       35    34.2
13       36    26.8
14       36    27.4
[1] covariance:
           Pressure    Mileage
Pressure  1.0000000 -0.1137098
Mileage  -0.1137098  1.0000000
[1] correlation:
           Pressure    Mileage
Pressure  4.3076923 -0.8923077
Mileage  -0.8923077 14.2951648