Decreased because it becomes more difficult to halt the procedure.
P(Type I) = .052
Under control unless there's a special sale or weekend shopping surge.
Under control unless some problem causes a surge in calls.
Out of control with surges during holiday season.
Out of control with upward (or perhaps downward!) trend.
Poisson, with λ = 4. Verify that counts in disjoint time intervals are independent
P(Y = 0) + P(Y = 1) ≈ 0.092.
1 − [P(Y = 0) + P(Y = 1)] ≈ 0.80.
The larger sample.
Check parts daily.
0.986573 = 0.99735
0.763101 = 0.9973100