Use Stevens' model of measurement scales to answer these questions:
a) What type of scale is used when the variable is social class? Explain.
b) What type of scale is used when the variable studied is a Top 40 list of popular songs? Explain.
c) What type of scale is used when the variable studied is intelligence scores (for example, on the Stanford-Binet-R)? Explain.
d) What type of scale is used when the variables studied are low and normal birth weights of newborns? Explain.