Final answer:
Quantitative research involving surveys with closed-ended questions and numerical data is more appropriate for the political campaign manager to identify ways of increasing contributions.
Step-by-step explanation:
For the scenario of the political campaign manager wanting to increase contributions in a short span of time, quantitative research is more appropriate. Quantitative research involves collecting numerical data that can be analyzed statistically. In this case, the manager can use surveys with closed-ended questions to gather information about the amount of contributions and the factors influencing them. A specific technique that can be used is a phone survey with Likert scale questions to measure the level of agreement or support for different strategies to increase contributions. This approach will provide measurable data that can help guide the campaign manager's decisions.