HW9_skeleton

9.2

• 1. Decreases
• 2. False
• 3. a
• 4. True
• 5. False
• 6. Robust
• 1. t= 1.316 w/ 25 degrees of freedom 0.10

  2. t= 1.697 w/ 30 degrees of freemdom 0.05

  3. t=-2.552 w/ 18 degrees of freedom 0.01

  4. t=-1.725 with 20 degrees of freedom 0.05 (left) t=1.725 with 20 degrees of freedom 0.05 (right)

• 1. t= 2.205 with 19 degrees of freedom 0.05

  b)t= 1.31 with 32 degrees of freedom 0.10

  3. t=-1.943 with 6 degrees of freedom 0.05

  4. t=-2.120 with 16 degrees of freedom is 0.025 and to the right t=2/120 with 20 degrees of freedom 0.025

• 13. 1.5
• 14. 25
• 1. 96% confidence interval is between 103.656 and 112.344

  2. A sample size decreases, margin of error (E) increases

  3. As the level of confidence decreases, the margin of error decreases

  4. no samples too small

• 1. (32.44,35.96)

  2. (32.73, 35.67)

  3. (31.89, 36.51)
• 29. (317.643, 394.557)
• 30. between 12.05 and 14.75

9.3

• 1. False
• 2. True
• 3. False
• 4. False
• 5. 10.1 & 30.1
• 6. 12.4 & 39.4
• 1. 23.7

  2. 20.64

  3. 31.37

• 11. 0.226 & 0.542