Statistics for Environmental Engineers

Скачать в pdf «Statistics for Environmental Engineers»


Tiao, George et al., Eds. (2000). Box on Quality and Discovery with Design, Control, and Robustness, New York, John Wiley & Sons.

Exercises


13.1 Find the Disturbance. Based on historical information, five machines vary randomly about an average level of 11.2 with a standard deviation of 1.0. The table below gives a series of operating data for each machine. Check each machine for change in average level, a “bump” of width = 3, a sinusoidal disturbance with period p = 12 and period p = 24, and a change in slope from 0 to 0.02.


Machine    Machine


Time


1


2


3


4


5


Time


1


2


3


4


5


1


11.8


11.8


11.8


11.8


11.8


26


11.4


12.3


14.9


11.4


11.9


2


11.7


11.7


11.7


11.7


11.7


27


13.0


14.0


16.5


13.0


13.5


3


13.0


13.0


13.0


13.0


13.0


28


10.6


11.5


14.1


10.6


11.2


4


11.1


11.1


11.1


11.1


11.1


29


11.3


11.8


14.8


11.3


11.9


5


10.5


10.5


10.5


10.5


10.5


30


10.9


10.9


14.4


10.9


11.5


6


10.5


10.5


10.5


10.5

Скачать в pdf «Statistics for Environmental Engineers»