HW6_skeleton

7.2

• 1. standrad normal distribution
• 2. bigger or equal to
• 3. 40, 0.3085
• 4. 0.4207
• 1. 0.4207

  2. 0.0071

  3. 0.3336

  4. 0.9998

• 1. 0.0013

  2. 0.9441

  3. 0.0375

  4. 0.0009

• 15. 0.67
• 17. 2.575, -2.575
• 18. z=1.885, z2=2.5
• 23. 0.9838

shadenorm(mu=50, sig=7, above = 35,col = "blue",dens = 150)

• 24. -0.0162

shadenorm(mu=50, sig=7, above = 65,col = "blue",dens = 150)

• 25. 0.2838

shadenorm(mu=50, sig=7, below = 45,col = "blue",dens = 150)

• 1. observational study, data collecte dover time

  2. whether or not patients have hypothermia, qualitative variable

  3. survival status is qualitative, length of stay in the ICU is quantitative, time spent on ventilator, quantitative

  4. time spent on ventilator is a statistic

  5. population: male patients who have an out-of-hospital cardiac arrest

  6. 0.712, 0.581

8.1

• 1. sampling distribution
• 2. standard deviation/square root on n
• 3. standrad error: mean
• 4. true
• 5. false
• 6. true
• 7. it’s a normal distribution
• 8. yes
• 9. 2, 80
• 10. 64, 3
• 1. its’ normal

  2. 0.0668

  3. 0.0179

  4. 0.7969

• 1. 0.33520

  2. 3.578

  3. 0.0465

  4. 0.0040

  5. Unusual observation

  6. 0.9844