1. Why does a RCT prevent omitted variable bias?

The RCT uses specially chosen volunteers

The volunteers know that they are in an experiment

It prevents outside factors from impacting the outcome.

The outside factor is no longer correlated with treatment

2. Researchers conducted a RCT at the UT nursery, regarding food and disciplinary behavior.

All of the children at the nursery participate in the study, and all comply with their assigned treatment status.

The treated children had a free breakfast at the beginning of the day, and the control students did not.

They find no difference in the disciplinary behavior between the groups throughout the term.

Assuming it was a well implemented study what can we conclude?

The RCT was incorrectly implemented

There is no casual impact of free breakfasts on these students disciplinary behavior

There is a correlation between treatment status and

There is no casual impact of free breakfasts on any students disciplinary behavior