Develop a research design to provide a demand estimate for the following new products:
a. A plastic disposable toothbrush that comes in a cylinder 5/8 inches in diameter and 3 inches in length. Its unique, patented quality is that the toothpaste already has been applied.
b. A lemon condiment. Lemon enhances the flavor of many foods, including corn on the cob, fish, and melons. The lemon condiment would be in a crystallized form that would capture the essence of lemon and be served in a "lemon shaker" that would complement salt and pepper shakers.
c. A clear plastic umbrella attachment for bicycles, which folds away behind the handlebars when not in use.
d. A vibrator secretarial chair, which contains a gentle vibrator device designed to provide relaxation and blood circulation for people who must sit for long periods of time.
e. A battery-powered, two-passenger automobile with a top speed of 40 mph and a range of 120 miles.