Homework 6: Problem 7
(1 point)
For each of the following, choose the most appropriate alternative hypothesis.
A. A team of physicians wanted to know whether living in the country is better for your lungs than living in the city. To eliminate possible variation due to genetic differences, they located seven pairs of identical twins with one member of each pair living in the country and the other in the city. For each pair of twins, they determined which person had more particles in their lungs. Let $p$ represent the long-term probability that the twin in the country will have healthier lungs.
A. $H_1: p > 0.5$
B. $H_1: p < 0.5$
C. $H_1: p \neq 0.5$
b. In 1994, 47% of parents who had children in grades K-12 were satisfied with the quality of education their kids received. In 2010, the Gallup organization conducted a survey of 1013 parents to determine whether the percentage of parents who are satisfied had changed.
A. $H_1: p > 0.47$
B. $H_1: p < 0.47$
C. $H_1: p \neq 0.47$
c. According to the Centers for Disease Control, in 2008, 21% of adult Americans smoked cigarettes. A public health researcher suspects that the percentage is lower now, due to improved public health campaigns and the increasing cost of cigarettes.
A. $H_1: p > 0.21$
B. $H_1: p < 0.21$
C. $H_1: p \neq 0.21$
Note: You can earn partial credit on this problem.
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