Person perception is a term that can be understood as the individual's tendency to form opinions and impressions of other individuals. These impressions are formed based on observation, preconceived information, biases, intuition and different cognitive processes.
In this particular case, Ruby engaged in the process of: Person perception.
A result would be considered as valid if it is created by using proper logical thought or common way of reasoning. But, such result on personality would not be considered to be reliable because there are too many factors that could create a deviation within the data, and there is no accurate way to truly measure personality.