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# DATA EXERCISE 3
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# 1. how many variables are contained in the macro dataset ?
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# 2. how many units/observations/records are contained in the macro dataset?
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# 3. What is the function of the following graphical parameters: 
# col, ylab, xlab, main, lwd, xlim, ylim, cex
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# 4. Why does the cor(macro) command return an error while the cor(macro.variables) does not?
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# 5. Which variables have the highest correlation coefficient?  Interpret this in words.
# What is the 95% confidence interval around this correlation coefficient?
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# 6. create a loop that creates a dummy variable for the years when 
# Ronald Regan was president 1981-1989
# HINT: Use an & statement to add a second condition within the if statement
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# 7. Estimate the value of Unemployment when trade and capmob are at
# their means and gdp varies from its min to its max and plot the relationship
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