HW8_skeleton

9.1

• 1. point estimate.
• 2. level of confidence.
• 3. false.
• 4. critical value.
• 5. increases.
• 6. decrease.
• 7. 1.645.
• 8. 2.575.
• 9. 2.33.
• 10. 1.75.
• 15. (0.146<p<0.254)
• 16. (.319,0.481)
• 21. type answer here.
• 1. The confidence intervcal interpretation doesnt take margin error into account

  2. This interpretation of conf. interval applies the margin of error to level of cofience as opposed to the mean

  3. This interpt of confidence intervation wrongfully interprets the confidence interval as probability

  4. This is a reasonable interpretation of confidence interval

• 1. population proporiton = .15

  2. =282.60 (greater or less than 10) & the sample is less than 5% of the population

  3. Lowerbound= .402 and Upperbound=.459

  4. 95% confident the population proporition of workersin the US 25 years old and older who have less than 10k in savings are between 0.402 and .459