Solutions Statistics

A researcher is interested in seeing whether smokers can be sensitized to the harm of smoking by wat

Question: A researcher is interested in seeing whether smokers can be sensitized to the harm of smoking by watching a film. She selects a sample of 12 smokers and asks them the number of cigarettes smoked per day. She then has these smokers watch a film that graphically demonstrates the physical harm caused by smoking, with the goal being that the film will reduce the number of cigarettes smoked. One week later, the subjects are asked for the number of cigarettes they are now smoking per day. The Before, After, and Difference scores (where difference equals Before minus After) are shown below, and the research wants to know if the film had the desired impact: (13 points)