Although all my products are low in fat, this answer can help me to gain awareness. My pronouncing that my products are all low in fat, people who have answered this question yes, will seek out my product, because of its low in fat nature.
You need to explain: i?? if your questions are open or closed i?? the dis/advantages of using open/closed i?? the data obtained by using open (this is qualitative), closed (which is quantative) i?? the most appropriate to use in certain circumstances eg if you are asking someone questions whilst they are waiting in a queue then closed questions would be the best etc.
This will allow me to reckon whether they really find sandwiches a healthy alternative to junk foods and if they prefer eating this nutritious meal from burgers or pizzas. I would be able to see if sandwiches are a popular good to buy. My market is low fat in nature.
If a lot of my customers are vegetarian, I can introduce no meat sandwiches. This goes the same for Halal meats. If I experience a low number of people eating meats, than instead of buying Halal meats, which are expensive, I can introduce more vegetarian meals to cater for there needs.