The following sample data contains the number of years of college and the current annual salary for a random sample of heavy equipment salespeople. 
a. Which variable is the dependent variable? Which is the independent variable?
b. Determine the least squares estimated regression line.c. Predict the annual income of a salesperson with one year of college.d. Test if the relationship between years of college and income is statistically significant at the .05 level of significance.e. Calculate the coefficient of determination.
f. Calculate the sample correlation coefficient between income and years of college. Interpret the value you obtain.
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