Hw7_skeleton

8.2

• 1. 0.44
• 2. sample proportion, x/n
• 3. False
• 4. True
• 5. p-hat is approximetly normal when nor= 10
• 6. The standard deviation will decrease as n increases
• 7. np(1-p)=500(0.4)(0.6) = 120 >or= 10 phat mean = 0.4

square root of 0.4(1-0.4)/500 standard deviation = 0.022

• 8. np(1-p)=300(0.7)()

square root of 0.7(1-0.7)/300 standard deviation = .026

• 1. Distribution of phat is approximetly normal with mean = 0.35, and standard deviation = 0.0015

  2. 0.0040

  3. 0.0233

• 1. Distribution is approximetly normal with mean np=1460(0.42)=613.2 and standard distribution = 18.9

  2. 0.0102

  3. 0.0606

• 1. Distrubution is approximetly normal with mean = 0.39 and standard deviation = 0.022

  2. 0.3228

  3. 0.3198

  4. 8/100 random samples of n=500 will have 210 responses that say marrige is obsolete