The graph below shows the mean success rate of cutting down on smoking (positive score = success) in people who wanted to quit and people who did not want to quit. Which of the following statements is the most true?
A. On average, people who wanted to quit were 25 times more successful than those who did not.
B. On average, success was six times higher in people who wanted to quit than in those who did not.
C. The average success was significantly higher in people who wanted to quit.
D. The effect in the population is likely to be the same for those who did and did not want to quit.
Answer: D
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