The primary interest of designing a randomized block experiment ...

[melly21297]

The primary interest of designing a randomized block experiment is to:
 a. reduce the within-treatments variation to more easily detect differences among the treatment means.
  b. increase the between-treatments variation to more easily detect differences among the treatment means.
  c. reduce the variation among blocks.
  d. None of these choices.

Question 2

A production facility produces 75 units per hour and uses an x chart to monitor its quality. The control limits are seat at 2.5 standard errors from the mean. On average, how many units will be produced until the control chart signals that the process is out of control, when it is in fact under control?

[nixon_s]

Answer to Question 1

A

Answer to Question 2

Since P = P ( z  > 2.5) = .0124, then ARL = 1/P = 1/.024  81 samples should be taken.
Number of units = 75 units per sample  81 samples = 6,075 units.

[melly21297]

Gracias!

[marict]

Great answer, keep it coming