Final answer:
False. Cell phones and caller ID have not reduced the problem of selection bias in public opinion surveys.
Step-by-step explanation:
The statement that cell phones and caller ID have dramatically reduced the problem of selection bias in public opinion surveys is false. Caller ID and cell phones have actually contributed to selection bias in surveys. The shift from landlines to cell phones means that individuals who only have cell phones are less likely to be included in the survey sample. This can result in a sample that is not representative of the entire population being studied. Furthermore, the use of cell phones can also introduce other sources of bias. For example, not everyone has a cell phone, and cell phone numbers are not always listed in directories. Additionally, individuals may not be at home to answer a phone call, leading to a higher chance of non-response bias.