Classify the relationships and justify your choice in each case. Assume the independent variable is mentioned first
a) A strong positive correlation exists between students’ marks in Kitchener high
schools and the city’s air quality index.
b) There is a positive correlation between the earth’s average air temperature and
the concentration of CO2 (carbon dioxide) in the atmosphere
c) Human alcohol consumption and level of coordination have a strong negative
correlation
d) Interest in televised sport is positively correlated with fitness level
e) Movie box office sales are negatively correlated with ticket price
f) Highway traffic congestion is positively correlated with the number of
urban expressways.
types of relationships:
Cause and effect relationship is the correlation between two variables in which
a change in one directly causes a change in the other
Common cause relationship is the correlation between two variables in which both
variables change as a result of a third common variable
Presumed relationship exists when two variables are related but no causality can
be inferred.
Reverse cause and effect relationship occurs when the assumed causation
becomes reversed.
Accidental relationship is a relationship that is based purely on coincidence.