The Experiment (2001)
Statistics: Design of Experiment 2?
The Federal Bureau of Investigation reports state-level and national data on crimes.
(a) An investigator compares the incidence of crime in Minnesota and in Michigan. In 2001, there were 3,584 crimes in Minnesota, compared to 4,082 in Michigan. He concludes that Minnesotans are more law abiding. After all, Michigan includes the big bad city of Detroit. What do you say?
(b) An investigator compares the incidence of crime in the U.S. in 1991 and 2001. In 1991, there were 28,000 cases, compared to 22,000 in 2001. She concludes that the U.S. has became more law-abiding over that time period. What do you say?
Hi,
(a) This comparison of the number of crimes in 2 different states does not take into account the difference in their populations. In 2001, Minnesota had 3,584 crimes for 4,984,100 people, while Michigan had 4,082 crimes for 10,006,963 people.
In actuality Minnesota had 719 crimes per million while Michigan had only 408 crimes per million people. Michiganers are actually more law abiding. The investigator’s conclusion was wrong.
(b) The citizens in the U.S. had become more law abiding from 1991 to 2001 because the number of crimes decreased while the population grew from 252 to 285 million people. This conclusion is correct.
I hope that helps!! 
Das Experiment (2001) – US Trailer 3
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