HW9_skeleton

9.2

• 1. type answer here. Decreases
• 2. type answer here. False
• 3. type answer here. alpha
• 4. type answer here. True
• 5. type answer here. False
• 6. type answer here. Robust
• 1. type answers here. 1.316
  2. type answers here. 1.697
  3. type answers here. -2.552
  4. type answers here. 1.725
• 1. type answers here. 2.205
  2. type answers here. 1.309
  3. type answers here. -1.943
  4. type answers here. 1.746
• 13. type answer here. point estimate:21 margin of error: +/- 3
• 14. type answer here. point estimate: 25 margin of error: +- 5
• 1. type answers here. Lower bound: 103.656 Upper bound:112.344
  2. type answers here. Lower bound: 100.42 Upper bound:115.58 Decreasing the sample size increases the margin of error.
  3. type answers here. Lower bound: 104.58 Upper bound: 111.42 Decreasing the level of confidence decreases the margin of error
  4. type answers here. If n=15 the population must be normal
• 1. type answers here. Not reasonable because we are not calculating probability.
  2. type answers here. Reasonable because we are calculating confidence interval.
  3. type answers here. Unreasonable because the 95% does not refer to as a percentage.
  4. type answers here. Unreasonable because it’s extra information not given in the problem.
• 29. type answer here. Lower bound: 317.63 Upper bound: 394.57
• 30. type answer here. Lower bound: 12.05 Upper bound: 34.59 ###9.3
• 1. type answer here. False
• 2. type answer here. True
• 3. type answer here. False
• 4. type answer here. False
• 5. type answer here. Lower=10.117 Upper=30.144
• 6. type answer here. Lower=12.401 Upper=39.364
• 1. type answers here. Lower bound: 7.94 Upper bound: 23.66
  2. type answers here. Lower bound: 8.59 Upper bound: 20.63 The width of the interval decreases
  3. type answers here. Lower bound: 6.61 Upper bound: 31.36 The width of the interval increases
• 11. type answer here. Lower bound:0.226 Upper bound: 0.542 We can be 95% confident that the population standard deviation of the pH of rainwater in Tucker County, WV is between 0.226 and 0.542.