HW9_skeleton

9.2

• 1. decrease
• 2. false
• 3. t2
• 4. false
• 5. false
• 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. margin of error= 5, point estimate=21
• 14. margin of error=5, point estimate=25
• 1. lower bound=103.66, upper bound=112.34

  2. lower bound=100.42, upper bound=115.6, decreasing the sample size increases the margin of error

  3. lower bound=104.58, upper bound=11.42, decreases the margin of error

  4. no, because the sample was smaller than 30

• 1. unreasonable

  2. reasonable

  3. unreasonable

  4. unreasoable

• 29. lower bound=394.57, lower bound=317.63
• 30. lower bound=12.18, upper bound= 14.62, There’s a 99% that aults have read between 12.18 and 14.62 books a year

9.3

• 1. false
• 2. true
• 3. false
• 4. false
• 5. 10.117, 30.144
• 6. 10.856, 42.980
• 1. 7.94, 23.66

  2. 8.59, 20.62

  3. 6.61, 331.36

• 11. lower bound=0.226, upper bound=0.542, we are 95% confident that the pH for the population is between 0.226 and 0.542