HW8_skeleton

9.1

• 1. A point estimate.
• 2. Level of Confidence, (1-a)*100%
• 3. False
• 4. Critical Value.
• 5. Increases.
• 6. Decreases.
• 7. 1.64
• 8. 2.57
• 9. 2.33
• 10. 1.75
• 11. .225, .024, 270.
• 12. .0625, .0115, 70.
• 15. Lower Bound= 0.146, Upper Bound= 0.254
• 16. Lower Bound= .319, Upper Bound= .481
• 21. C is correct.
• 1. .181

  2. 341.81 is greater than or equal to 10.

  3. (.161, .194)

  4. We are 90% confident that the proportion of adult Americans who have donated blood in the past two years is between 0.168 and 0.194.

• 1. .43

  2. 282.6 is greater than or equal 10.

  3. (.401, .458)

  4. We are 95% confident that the proportion of workers and retirees 25 years and older with less than 10,000 in savings is between .401 and .485.