1. The problem asks to identify what is wrong with the survey conducted by StatCrunch. 2. The survey asked users if they expect to be better off than their parents, and 587 out of 1019 users responded positively. 3. Important to note: The survey was completed by StatCrunch users who chose to participate voluntarily. 4. Voluntary response samples often suffer from bias because individuals who feel strongly about the topic are more likely to respond. 5. This means the sample may not represent the larger population accurately. 6. The correct issue is that the sample is a voluntary response sample, which can lead to unrepresentative results. Final answer: D. The sample is a voluntary response sample. The respondents may not be representative of the larger population.