Suppose that you are interested in studying how successful public defenders representing defendants who are accused of having committed a particular crime in the state of North Carolina are. You wish to understand what percent of defendants accused of this crime are represented by a public defender. You observe that the sampling design used by your colleagues to select defendants is to randomly select 56 of the home phone numbers listed by defendants. This is a problem because naturally some portion of these defendants are currently jailed and will not be able to answer the phone if they are selected for the sample. Although there could be multiple problems with this sampling design, the described flaw most clearly indicates that there will be: