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?
A)An observational study that is a sample survey
B)An observational study that is not a sample survey
C)An experiment but not a double-blind experiment
D)A double-blind experiment
E)A block design

Question

Quizplus · Accepted Answer

This study is an observational study because the researchers did not manipulate any variables and simply observed the difference in cancer rates between those who had smoked regularly and those who had not. Additionally, it is a sample survey because the researchers surveyed a large sample of adults to collect their data.

In Order to Determine If Smoking Causes Cancer,researchers Surveyed a Large