What specific research question and hypothesis are suggested about Baskin-Robbins: Can It Bask in the Good 'Ole Days?

The key question and hypothesis for the brand team is this: Has Baskin-Robbins determined the right research problem? The brand team presented the answer to this major question by developing two things to discuss in a field research project. First, do consumers of Baskin-Robbins have a preference for the newly designed logo over an old one? Second, do twice as many Baskin-Robbins consumers prefer the new logo than the old logo? These main questions focus on the preference for a new logo upon considering how the new store interiors would look like.

Step-by-step explanation

That's all! Since you were only asking for the research question and hypothesis, those are what I provided. The answer may be brief but they are self-explanatory (assuming you have also read the case entirely).

I am hoping that I have covered all the points you were expecting my answer to cover. If you have any other ideas you can add them on my answers. If you want to omit some parts of my answer, feel free to do so.