Chantix is a prescription pill used to help smokers who want to quit. However, s

Question

Chantix is a prescription pill used to help smokers who want to quit. However, some

doctors are concerned about the potential negative side effects of the drug including nausea,

abnormal dreams, insomnia, and headache. A study of the safety and effectiveness of

Chantix included 1,493 smokers wanting to quit who volunteered to participate in a clinical

trial of the drug. Of the 751 smokers randomly assigned to take Chantix over a 24-week

period, 28 experienced serious side effects. Of the 742 smokers randomly assigned to take a

placebo over the same period, 16 experienced serious side effects. Researchers were

interested in whether the data provide convincing statistical evidence that taking Chantix

would increase the risk of serious side effects among all smokers similar to the volunteers.

1. Does this study represent an experiment or observational study?

2. Define the explanatory and response variables.

3. What is the unknown parameter of interest in this study?

Explanation / Answer

1) this study represent an experiment

2)The response variable is the focus of a question in a study or experiment. Anexplanatory variable is one that explains changes in that variable. It can be anything that might affect the response variable.

Here the response variable is taking chantix. Explanatory variable is negative side effects

3) here the perimeter of interest is p , the proportion of smokers who experience side effect

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