Question

What can be said of the correlation between the brand of an automobile and its quality?

Answer 1

a)The correlation is negative, because smaller cars tend to have higher quality, and larger cars tend to have lower quality.
b)The correlation is positive because better brands have higher quality.
c)If correlation is negative, an arithmetic mistake was made. Correlation must be positive.
d)Correlation makes no sense here because “brand” is a qualitative variable.