Section 1.3 Homework

1.  Explain the difference between a​ single-blind and a​ double-blind experiment.

Choose the correct answer below.

1. A single blind experiment is one in which each experimental unit is randomly assigned to a treatment. A​ double-blind experiment is one in which similar experimental units are grouped together and the experimental units within each block are randomly assigned to treatments.
2. In a​ single-blind experiment, the subject does not know which treatment is received. In a​ double-blind experiment, neither the subject nor the researcher in contact with the subject knows which treatment is received.
3. In a​ single-blind experiment, the researcher does not know what the response variable is. In a​ double-blind experiment, neither the subject nor the researcher knows what the response variable is.
4. In a​ single-blind experiment, there is a control group. In a​ double-blind experiment, there is both a control group and a placebo treatment is used.