HW9_skeleton

9.2

• 1. Decreases.
• 2. False.
• 3. Alpha.
• 4. True.
• 5. True.
• 6. Robust.
• 1. 1.316.

  2. 1.697.

  3. -2.552.

  4. 1.725.

• 1. 2.205.

  2. 1.309.

  3. -1.943.

  4. 2.120.

• 13. x(bar)=21, E=3.
• 14. x(bar)=25, E=5.
• 1. LB: 103.7, UB: 112.3.

  2. LB: 100.4, UB: 115.6, decreased sample size causes increased margin of error.

  3. LB: 104.6, UB: 111.4, decreased confidence causes decreased margin of error.

  4. no because the sample size has to be n is more than or equal to 30.

• 1. False, confidence does not equal probability.

  2. True.

  3. False, 95% confidence not population (population is 100%).

  4. False, no mention of Idaho.

• 29. LB: 317.6, UB: 394.6.
• 30. LB: 12.1, UB: 14.7.

9.3

• 1. False, skewed right.
• 2. True.
• 3. False.
• 4. False.
• 5. LB: 10.117, UB: 30.144.
• 6. LB: 12.401, UB: 39.364.
• 1. LB: 7.94, UB: 23.66.

  2. LB: 8.59, UB: 20.63, interval width decreases.

  3. LB: 6.61, UB: 31.36, interval width increases.

• 11. LB: 0.051, UB: 0.293.