single-blind study. single-blind study. Etymology: L, singulus, one by one; AS, blind + L, studere, to be busy. an experiment in which the person collecting data knows whether the subject is in the control group or the experimental group, but subjects do not. See also double-blind study.
The suit alleges that Pizza Hut's mandatory delivery fees give customers the impression that they are part of the tip, but drivers receive no portion of it, says the Associated Press.he Hut isn't the only pizza chain to get backlash from employees on shady fee practices: Last year, U.K. chain Pizza Express came under fire for keeping 8 percent of its workers' credit card tips, which it claimed was to cover credit card processing fees.
Good carryout service calls for a tip. If you drive to the restaurant and go inside to pick up the food, there is no need to tip. However, if someone brings the food to your car, you should tip 10 percent. Tip $2 to $5 for pizza delivery. A tip of 10 to 20 percent is appropriate for delivery of all other foods to your home.