9.5 Exercise 65

Over the past few decades, public health officials have examined the link between weight concerns and teen girls' smoking. Researchers surveyed a group of 273 randomly selected teen girls living in Massachusetts (between 12 and 15 years old). After four years the girls were surveyed again. Sixty-three said they smoked to stay thin. Is there good evidence that more than 30% of the teen girls smoke to stay thin?
After conducting the test, your decision and conclusion are

1. Reject H₀: There is sufficient evidence to conclude that more than 30% of teen girls smoke to stay thin.
2. Do not reject H₀: There is not sufficient evidence to conclude that less than 30% of teen girls smoke to stay thin.
3. Do not reject H₀: There is not sufficient evidence to conclude that more than 30% of teen girls smoke to stay thin.
4. Reject H₀: There is sufficient evidence to conclude that less than 30% of teen girls smoke to stay thin.