Hypothesis Testing Proportions 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. 63 said they smoked to stay thin. Is there good enough evidence that more than 30% of the teen girls smoke to stay thin? The alternative hypothesis is:

• Ha:p>0.30
• Ha:p<0.30
• Ha:p0.30
• Ha:p0.30