In a randomized controlled experiment there is a control group and a treatment group. Randomized controlled experiments are are highly structured experiments in which manager obtains the data to work smarter based on the resources available. These are use din business environment and not time consuming or costly ; all you need to do is to have the data available of the business segment you want to evaluate. Randomization makes one feels more confident that any result he get is actually caused by the independent variable of interest.
Students are more likely to be honest in an anonymous survey, while they are less likely to be honest in a face to face interview - possibly because of fear of judgment or punishment