Roper Through the roper reports worldwide, GFK Roper conducts a global consumer survey to help multinational Companies understand different consumer attribute throughout the world. Within 30 countries, the researchers interview 1000 people age 13 through 65. They are samples are designed so that they get 500 males and 500 females in each country. (www.gfkameroca.com)

a) are they using a simple random sample? Explain.

b) what kind of design do you think they are using?

Drug tests Major league baseball chess players to see whether they are using performance - enhancing drugs. Officials select a team at random, and a drug testing crew shows up on announced to test of 40 players on the team. Each testing they can be considered a study of drug use in major league baseball.

a) what kind of sample is this?

b) is that choice appropriate?

for the next 4 questions ,for the reports about statistical studies, identify the following items (if possible).

A) The population

b) The population Parameter of interest

c) The sampling frame

d) The sample

e) The sampling method, including whether or not randomization was employed

f) Who (is anyone) was left out of the study

G) Any potential sources of bias you can detect in any problems you see in generalizing to the population of interest

1. medical treatments Consumers union asked all subscribers whether they had to use alternative medical treatments and, if so, whether they had benefited From them. For almost all of the treatments, approximately 20% of those responding reported cures and substantial improvement in their condition.
2. Mayoral race Hoping to learn what issues may resonate with voters in the car coming election, the campaign Director for a mayoral candidate select one block from each of the cities election districts. Staff members go there an interview all the adult residence they can find.
3. roadblock State police set up a roadblock to estimate the percentage of cars with up-to- date registration, insurance, and safety inspection stickers they usually find problems with about 10% of the cars they stop.
4. milk samples Diary inspectors visit forms unannounced and take samples of the milk to test for contamination. If the milk is found to contain dirt, antibiotics, or other foreign matter, the milk will be destroyed in the farm reinspected until purity is restored.