Question

When is it useful to use the Completely Randomized design? Select one: a. To handle extraneous variables b. All the answers are correct c. When the light in a greenhouse experiment is not uniform d. In a field with uniform conditions

Answer 1

The Completely Randomized design is useful when conducting experiments in a field with uniform conditions. Therefore, the correct answer is d.

Step-by-step explanation:

In a Completely Randomized design, the experimental units are randomly assigned to treatments, with each unit having an equal chance of receiving any particular treatment. This design is useful when the experimental conditions are uniform and there is no need to control for specific extraneous variables. For example, if an experiment is being conducted in a field with uniform soil conditions, the Completely Randomized design may be used to randomly assign treatments to different areas of the field. This allows for a fair comparison of the treatments, as any differences in the response variable can be attributed to the treatment and not to differences in the experimental units.

Answer 2

d. In a field with uniform conditions

Step-by-step explanation:

In a CRD, the treatments are assigned randomly to the experimental units, and all units have an equal chance of receiving any particular treatment. This design is particularly useful when the experimental units are homogeneous and there are no extraneous variables to control. When the experimental units are well-defined and uniform, the CRD ensures that the treatment effects are not confounded with any other factors.