Find the covariance between hourly wage X and education Y (measured in years of schooling) using the following summary statistics for a sample of 10 workers in a plant.
xbar = 11.775 ybar=13.8
sum of (x-xbar)(y-ybar) = 103.55
sum of xy =1728.5
a) Find the covariance between x and y
b) Interpret the results