A new program was created to help people smoke less. Table 5.13 gives the average number of cigarettes smoked (per day) before participating in the program and the average number of cigarettes (per day) after participating in the program for a sample of nine program participants. Can you conclude whether the program was effective in helping people to smoke less?

Table 5.13

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Number of Cigarettes Smoked Per Day Before and After Participating in a Program Created to Help People Smoke Less Number of Cigarettes Number of Cigarettes (Per Day) Before (Per Day) After Difference (Before - After) 15 13 12 10 10 10 22 20 2202 2 16 15 1 11 12 8 9 6 727 26 2+ 2 4