Question

A well-designed experiment should have which of the following characteristics?
I. Subjects assigned randomly to treatments
II. control group or at least two treatment groups
III. Replication
A. I only
B. I and II only
C. I and III only
D. II and III only
E. I, II, and III

Answer 1

Answer:

The answer is E: I, II, and III

Step-by-step explanation:

The three major features of a well designed experiment are:

1. Replication: If an experiment cannot be replicated, then it is not a well-designed experiment. Replication is one of the major characteristics of a well designed experiment

2. Control: A well designed experiment must have a control. Control, in an experiment, can be referred to as the steps taken to curb the impact of extraneous variables

3. Randomization: Subjects are expected to be randomly assigned to different groups.

Answer 2

This is about random distribution.

Option E is Correct.

The three major characteristics that make up a well designed experiment are as follows:

• 1. Replication: This is very important because If we can't replicate an experiment, then it means such an experiment is not credible because a credible experiment needs to be able to be repeated several times to confirm results. Thus, if it can't be replicated, then we can't classify it as a well-designed experiment.

• 2. Control Groups: This is very important because there definitely has to be a way to get all the variables under so that only one can be changed per time. Preventing the impact of extraneous variables is very key in a well designed experiment and thus there must be control group or groups.

• 3. Random Assignment: This is very important because the treatment groups have to be similar to each other and to the control group as well. Thus, subjects must be randomly assigned to treatments or control groups.

Looking at the options and our features above, all the given characteristics are important. Thus, Option E is correct.

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