Hw7_skeleton

8.2

• 1. .44
• 2. Sample proportion; x/n
• 3. False
• 4. True
• 5. When np(1-p)>10
• 6. As the sampling size increases, the standard deviation of p decreases; it is reduced by half
• 7. p=.4; Standard deviation=.022
• 8. Shape: normal, Mean=0, Standard Deviation=.0264
• 1. M=.35; Standard deviation of sampling proportion=.015

  2. Probability x=390 or more= .0040

  3. Probability x=320 or less=.0233

• 1. M=.42; Standard deviation of sampling proportion=.00017

  2. Probability x=657 or more=.0102

  3. Probability x=584 or less=.0606

• 1. p=.39; Standard deviation=.0218

  2. -.459

  3. The probability that 500 Americans between 40% and 45% believe that marriage is obselete is .33.

  4. Probability=.08378. So, about 8 out of 100.