With the below question, I believe that I am required to do a Hypothesis Test. However, I am unsure how to conduct this in order to answer the below question properly. Could you please help on how to do this hypothesis test? The n = 191. Specifically, I am really unsure what the null hypothesis and alternative hypothesis is. Is anyone able to show me the full workings?

"Based on casual observation, my sense is that out biggest shopper segment is established adults above 40 with a significant amount of annual disposable income (i.e. with disposable incomes between $80,001 and $100,000 per year). Can you establish whether this conjecture is true?"