In a designed experiment a quality manager is presented with

In a designed experiment, a quality manager is presented with the following conditions:

Control of confounding variables

Randomization in assigning subjects to different treatments

Replication of the experiments using sufficient number of subjects

Which of the conditions is/are important for the experiment to be robust?

Solution

ANSWER

Control of confounding variables,Randomization in assigning subjects to different treatments,Replication of the experiments using sufficient number of subjects.

All of these three conditions are important for the experimental design to be robust.

Explanation:- Confounding variables or confounders are often defined as the variables correlate (positively or negatively) with both the dependent variable and the independent variable.Confounders are common causes of both treatment/exposure and of response/outcome. Confounding is better taken care of by randomization at the design stage of the research.

In a randomized experimental design, objects or individuals are randomly assigned (by chance) to an experimental group. Using randomization is the most reliable method of creating homogeneous treatment groups, without involving any potential biases or judgements

To improve the significance of an experimental result,replication the repetition of an experiment on a large group of subjects, is required.Replication reduces variability in experimental results, increasing their significance and the confidence level with which a researcher can draw conclusions about an experimental factor.