Which of the following statements best describes the graph below?
A. The graph shows that for those who used nicotine patches there is a fairly normal distribution, whereas those who used hypnosis show a skewed distribution, where a very small proportion of people (relative to those using nicotine) smoke more than 2 cigarettes per day.
B. The graph shows that for those who used hypnosis there is a fairly normal distribution, whereas those who used nicotine patches show a skewed distribution, where a very large proportion of people (relative to those using nicotine) smoke less than 4 cigarettes per day.
C. The graph looks fairly unsymmetrical, indicating that the two groups are from different populations.
D. The graph looks fairly symmetrical. This indicates that both groups had a similar spread of scores before the intervention.
Answer: D
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