Statistics 1.6

Randomized block design

Randomized block design is used when the experimental units are divided into homogeneous groups called blocks. Within each block, the experimental units are randomly assigned to treatment.

Single-blind experiment

Single-blind experiments, the experimental unit (or subject) does not know which treatment he or she is receiving.

Completely randomized design

A completely randomized design is one in which each experimental unit is randomly assigned to a treatment.

Control group

A control group serves as a baseline treatment that can be used to compare it to other treatments.

Matched pairs design

A matched-pairs design is an experimental design in which the experimental units are paired up. The pairs are selected so that they are related in some way (that is, the same person before and after treatment, twins, husband and wife, same geographical locations). There are only two levels of treatment in a matched-pairs design.

double-blind experiment

Double-blind experiments, neither the experimental unit nor the researcher in contact with the experimental unit knows which treatment the experimental unit is receiving.

Experimental unit

Experimental unit is a person, object, or some other well defined item upon which a treatment is applied, often referred to as subject when he or she is person.

Blocking

Grouping together similar experimental units and then randomly assigning the experimental units within each group to a treatment is called blocking. Each group of homogeneous individuals is called a block.

Design

To design an experiment means to describe the overall plan in conducting the experiment. Conducting an experiment requires a series of steps.