You want to test people's reactions to a new artificial sweetener, and so you plan to give them coffee with two different kinds of sweetener. However, you are worried about possible cues you may give people as to which sweetener they're getting. So, you have your assistant prepare the packets so she knows which is which but you do not, and then you give the two coffees to your subjects. This type

of experiment is called a __________ experiment.

a. double-blind
b. single-blind
c. placebo effect
d. placebo bias

A