Final answer:
An appropriate type of question for the analyst's study would be an open-ended question, providing qualitative information that explores the motivations and behaviors of investors about their portfolio's value.
Step-by-step explanation:
Based on the financial analyst's study of whether an investor's portfolio value determines their likelihood to buy and sell stocks online, an appropriate type of question to ask about the given results would be an open-ended question. Open-ended questions are useful in gathering qualitative information that is subjective and varies from person to person, providing insights that are not easily quantified but offer depth and context. Examples of such questions include: How does the value of your portfolio influence your decisions to buy or sell stocks online? Can you describe a situation where your portfolio's performance affected your trading behavior? What factors, other than portfolio value, impact your decision-making in online stock trading? These questions could help a researcher understand the underlying motivations and behaviors of investors, which contribute to their actions beyond what can be measured numerically.