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.
Tips. A pizza delivery driver is tipped by most customers. The average tip is approximately $2 per delivery, but a tip can be as high as $5 per delivery or nothing at all. A typical pizza delivery driver will make approximately three deliveries per hour, which will earn him about $6 per hour in tips.ase Salary. Pizza delivery drivers earn the state minimum wage. This typically ranges from $7.25 to $8 per hour, depending on the state and local laws.