Think About It

  1. 21.

    1. Decreased because it becomes more difficult to halt the procedure.

    2. P(Type I) = .052

  2. 23.

    1. Under control unless there's a special sale or weekend shopping surge.

    2. Under control unless some problem causes a surge in calls.

    3. Out of control with surges during holiday season.

    4. Out of control with upward (or perhaps downward!) trend.

  3. 25.

    1. Poisson, with λ = 4. Verify that counts in disjoint time intervals are independent

    2. P(Y = 0) + P(Y = 1) ≈ 0.092.

    3. 1 − [P(Y = 0) + P(Y = 1)] ≈ 0.80.

  4. 27.

    1. The larger sample.

    2. Check parts daily.

  5. 29.

    1. 10±3×5/18

    2. 4±3×2/12

  6. 31.

    1. 0.986573 = 0.99735

    2. 0.763101 = 0.9973100

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