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Design a Quasi-experiment for the following: Are smoking and lung cancer related?

Design a Quasi-experiment for the following: Are smoking and lung cancer related?

Math   Statistics-And-Probability   
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In Quasi-experimental research, the researcher observes some phenomenon that has happened after-the-fact. The researcher studies some type of phenomenon, which she or he has not manipulated, and examines the relationship between two or more variables. In quasi-experimental research, there are no strict independent or dependent variables since it is
not clear as to what actually led to what.
Here we need to design a Quasi-Experiment for the fact that Is smoking and lung cancer related?

Thus we can construct this experiment as follows: we'll get a group of people who just started to smoke and give them lung x-rays to see their lung, another group would have people who have been smoking for about 25 years and they would be undergoing the same test.

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