Problem 3

population: all cars sample: cars stopped at checkpoint p: proportion of cars that have a safetey voilation phat: proportion seen at checkpoint with problems (14/134) Yes can be used

population: general public sample: People who respond on webstie p: proportion of people who favor prayer phat: proportion seen on website (488/602) No not representative

population: Parents at a school sample: Parents who chose to respond p: proportion of parents who want uniforms phat: proportion seen with reponses who favoired uniforms No not representative

population: Students at a college sample: All freshman for one year p: proportion of people who will graduate on time phat: proportion seen of class who gradutated Yes representative

Problem 5

  1. No, too confident

  2. No, doesn’t make sense

  3. Still no

  4. Nope

  5. No, it’s either one answer of the other

Problem 7

B and C are true, A and D are false

Problem 11

  1. 0.83, +- 0.0327

  2. Im 95% confident that the true proition is within that interval

  3. No theyre not, sicne 95% of all test will fall within a range close to that described by consumer reports