1. Robert Lamy is an equity advisor. One day he gathered information about three microeconomic variables X, Y, Z. He noticed that whenever variable X increased by one unit, variable Y decreased by 0.3 units but variable Z increase by 0.3 units. The correlation between variables X and Y and the correlation between variables X and Z, respectively, are closest to:
Correlation between　　　　　Correlation between
Variables X and Y　　　　　　variables X and Z