Hw7_skeleton

8.2

• 1. 0.44
• 2. Sample proportion, P^ = x/n
• 3. False
• 4. True
• 5. Sample size has to be less or equal to 5 % of population, np(1-p) is bigger or equal to 10
• 6. The bigger the sample size the smaller standard deviation. You cut the standard deviation of p^ in half by increasing the sample size by a factor of 4.
• 7. Normal, 0.4, 0.022
• 8. Normal, 0.7, 0.026
• 1. Normal, 0.35, 0.015

  2. 0.0039

  3. 0.0228

• 1. Normal, 0.42, 0.0129

  2. 0.0102

  3. 0.0606

• 1. Normal, 0.39, 0.022

  2. 0.3228

  3. 0.3198

  4. 0.0838 it depends how low a probability you find unusual