Statistics for Business: Decision Making and Analysis, 3rd Edition

You Do It

1. 35.

   1. 1

   2. 50

   3. 4(100/50) = 8

   4. 0.00468

2. 37.

   1. 4

   2. 40

   3. (100 + 25 + 25 + 25 + 225)/40 = 10

   4. 0.0404

3. 39.

   1. (0 + 20 + 2 × 9 + 3 × 14 + 4 × 5)/60 ≈ 1.667

   2. 60 × exp(− 1.667) ≈ 11.33

   3. 5 − 1 − 1 = 3

   4. 6.16 (P(4 or more) = 0.0883)

   5. 0.104

4. 41.

   1. χ² = 9.345, p = 0.025 (3 df)

   2. Long-term customers make significantly different types of complaints than recent customers do. Long-term customers complain more often about billing errors, and complain less often about salespeople.

5. 43.

   1. Not normal (fat tails)

   2. Expected counts become too small for χ².

   3. χ² = 49.16, with p-value 0.

   4. Yes

   5. Plot does not require conversion to categories; χ² gives a p-value so we can draw a conclusion.

6. 45.

   1. Large values of χ² indicate that the percentage of holes scored better or worse than par differ ...