Question

2. A study used self-administered mail questionnaires to gather data on height and weight in order to calculate the measure of obesity. Which of the following types of problems were SURELY AVOIDED by this method of data collection.

1) Interviewer Bias                                                  

2) Exposure misclassification                      

         

            3) Confounding                                              

            4) Selection Bias                                           

            5) Loss-to-follow-up             

Answer 1

A study used self-administered mail questionnaires to gather data on height and weight in order to calculate the measure of obesity.

Here, the most important is the Exposer misclassification. You have to first identify the study population and study sample, on whom You gonna study.

Selection bias may be there because you have less control over the study participant.

The loss to follow up is a big issue in self-administered mail survey Because you don't have any control over your participant.

Confounding may be an issue, but you can solve this by writing an easily understandable mail.