Answer:
Selecting people for the survey based on those who say they watch television with their children would introduce bias into the sample. People who watch television with their children may have different preferences than those who do not, and this could skew the results of the survey. Additionally, this method would exclude people who do not have children, or who do not watch television with their children for other reasons. On the other hand, using a random process to select participants for the survey would ensure that the sample is representative of the population, and would help to minimize bias. Random sampling would give each person in the population an equal chance of being selected for the survey, which would help to ensure that the results of the survey are accurate and can be generalized to the broader population.