The National Center for Drug Abuse is conducting a study to determine if the heroin usage among teenagers has changed. Historically, about 1.3 percent of teenagers have used heroin one or more times. In a recent study of 1800 teenagers, 35 said they had used heroin one or more times.

1. (15 points) Is there significant evidence that heroin usage among teenagers has changed?
2. (5 points) What concerns do you have about this data?
3. (5 points) Interpret the type I and type II errors in the context of the problem
4. (5 points) Which of the above errors are possible in this case?