HW8_skeleton

9.1

• 1. point estimate
• 2. (1-α) x 100%
• 3. false
• 4. critical value
• 5. increases
• 6. decreases
• 7. 1.645
• 8. 2.575
• 9. 2.33
• 10. 1.75
• 11. p-hat=.225, x=270, E=.024
• 12. type answer here.
• 15. lower bound=.146, upper bound=.254
• 16. type answer here.

1. flawed because theres no interval provided about the pop. prop.
2. flawed because it says the confidence level is varying

• 1. p-hat=.181

  2. np-hat(1-p-hat)=341.8 ≥ 10 and the sample is less than 5% of the population

  3. LB=.168, UB=.194

  4. 90% confident that the prop. of adults 18+ yrs who donated blood in the past 2 years is between .168 and .194