Question

For the survey described below, either selection bias or information bias can be operative and has the potential to influence the study validity ? A survey of disability in the elderly based on a sample of senior citizens selected from those attending dance lessons or fitness gyms in Chicago.

A. Selection bias

B. Information bias

C. Neither selection bias nor information bias

Answer 1

The correct answer is- A.Selection Bias.

EXPLANATION :

Here,the survey of disability in the elderly people is based on a sample of senior citizens selected from those attending dance lessons or fitness gym in Chicago.It is quite evident that,the proportion of disabled person will be very small when the sample is taken from those who attends the dance class or fitness gym.So,the obtained sample proportion of disabled person will not be a reasonable estimator of the actual population proportion of the disability in elderly people,due to the bias in the selection of the sample observations.

Hence,the correct answer is: A.Selection Bias.(ANSWER)