Answer:
IQ and head size are positively correlated.
Explanation:
Correlational research: In scientific and psychological research, The term, "correlational research" is determined as one of the different types of "non-experimental research" methods in which an investigation, researcher, or experimenter tend to measure or evaluate two different variables and therefore assess and understands the "statistical relationship" between the given variables in the absence of any influence from the extraneous variable.
Positive correlation: Relationship between two different variables that move in a similar direction.
In the question above, Joshua can conclude IQ and head size are being positively correlated.
When a cognitive function relies on one cerebral hemisphere more than the other, this phenomenon is known as lateralization.
This means that each side of the brain specializes in some things and works harder on those things than the other side and some neural functions or cognitive processes are specialized to one side of the brain or the other.