There are 500 people in Chicago who suffer from a particular
condition. You want to survey these people and you decide that since the survey
instrument is long, you will give a monetary incentive of $15 to each of the
individuals who completes the survey. You only have enough money to pay 45
people so you decide to draw a sample of 65 individuals because you can expect
that there will be some attrition.

QUESTION:

Your supervisor points out a few drawbacks to your design.
Discuss what these are/would be.