HW8_skeleton

9.1

• 1. type answer here. point estimate
• 2. type answer here. level of confidence
• 3. type answer here. false
• 4. type answer here. critical value
• 5. type answer here. increases
• 6. type answer here. decreases
• 7. type answer here. =.05 = 1.645
• 8. type answer here. =.005 = 2.575
• 9. type answer here. =.01 = 2.33
• 10. type answer here. =.04 = 1.75
• 11. type answer here. p hat= .225, E= .024 x= 270
• 12. type answer here. p hat= .0625, E=
• 15. type answer here. lower bound: .146 upper bound: .254
• 16. type answer here. lower bound: .319 upper bound: .481
• 21. type answer here.

1. False; no interval has been provided about the population proportion
2. False; this interpretation indicates that the level of confidence is varying
3. True
4. False; this interpretation suggests that this interval sets the standard for all the other intervals, which is not true.

• 1. type answers here. =.181
  2. type answers here. =341.8 is greater than 10, and the sample is less than 5% of the population
  3. type answers here. Lower bound= 0.168 upper bound= 0.194
  4. type answers here. We are 90% confident that the proportion of adult Americans 18 years and older who have donated blood in the past two years is between .168 and .194.
• 1. type answers here. .430
  2. type answers here. =282.6 is greater than 10, and the sample is less than 5% of the population
  3. type answers here. Lower bound= .401 upper bound=. 459
  4. type answers here. We are 95% confident that the proportion of workers and retirees in the United States 25 years of age and older who have less than $10,000 in savings is between