Question

In order to determine if smoking causes cancer, researchers surveyed a large sample of adults. For...

In order to determine if smoking causes cancer, researchers surveyed a large sample of adults. For each adult they recorded whether the person had smoked regularly at any period in their life and whether the person had cancer. They then compared the proportion of cancer cases in those who had smoked regularly at some time in their lives with the proportion of cases in those who had never smoked regularly at any point in their lives. The researchers found a higher proportion of cancer cases among those who had smoked regularly than among those who had never smoked regularly. What type of study is this?

  1. An observational study that is a sample survey
  2. An observational study that is not a sample survey
  3. An experiment but not a double-blind experiment
  4. A double-blind experiment
  5. A block design
Math   Statistics-And-Probability   
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Answer #1

Solution :

In an observational study, the researcher only observe the subjects and try to study the phenomenon of interest without any manipulation. The researcher do not have any control over the subjects.

In the given scenario, the researchers have only observed the large number of people and they recorded the smoking behavior of the subjects and whether they have cancer or not.

Hence this is a observational study.

Option A is correct which is given below :

An observational study that is a sample survey.

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