Cigarette smoking is the only form of tobacco use that increases risk for cancer.​

The proportion of Americans using standard health care who also use alternative health care is ________ compared to the proportion of Americans using alternative health care who also use standard health care.​

A) ​bigger
B) ​equal
C) ​smaller
D) ​similar

​If two variables increase or decrease together, they are

A) ​positively correlated.
B) ​negatively correlated.
C) ​positively skewed.
D) ​negatively skewed.

​What is most accurate about recent statistics on death rates relative to education?

A) ​People with high school educations die half as often as people with less education.
B) ​People with college educations die less than half as often as high school graduates.
C) ​People with college educations die half as often as those with less than high school.
D) ​People with high school or college get the same benefit compared to those without.