Final answer:
The correct course of action for room assignment is a) Random assignment, as it is central to experimental design for averting bias and increasing the validity of the results. This concept is also important in scientific polling, where a random sample is vital but a leading question is not appropriate.
Step-by-step explanation:
Given the context provided, where both treatments were experienced by all subjects and the order of treatments was randomly assigned to eliminate the influence of lurking variables, the appropriate action for assigning individuals to their required rooms during construction on the right side of the highway would be a) Random assignment. Random assignment is a crucial component in experimental design to ensure that each participant has an equal chance of being placed in any group, which reduces bias and increases the reliability of the results.
As for scientific poll designs, a leading question is not considered a good practice as it could influence the responses and thus skew the results. Instead, having a random sample is an essential aspect to achieve representativity.