Using unemployment data provided by the United Nations, investigate the association between the male unemployment rate in 2007 and 2010 for a sample of 75 countries.

a) Find a regression model predicting the 2010 rate from the 2007 rate.

b) Examine the residuals to determine if a linear regression is appropriate.

c) Test an appropriate hypothesis to determine if the association is significant.

d) What percentage of the variability in the 2010 rate is ac-counted for by the regression model?