- The original SAT was normed so that scores would be normally distributed, with a mean of 500, and a standard deviation of 100 points. If that is true, who portion of a sections test takers have scores: (hint: these will be easier if you draw a bell curve)
- Of 500 or higher?
- Higher than 700?
- Between 300 and 700?
- EITHER higher than 700 or less than 300?
- Work with the US Macro data from previous weeks. You may want to destring the year and quarter variables if you have not done so already.
- Standardize the GDP Growth variable (in other words calculate z-scores

for each data point. What is the z-score for GDP in the 4th quarter of 2008? What does this z-score tell you about how extreme (or not extreme) GDP was in that quarter? Does this match what you would expect? - Create a 95 percent confidence interval for the unemployment rate variable. Write a sentence explaining what this confidence interval tells you.
- Create a 95 percent confidence interval for the unemployment rate between 2007 & 2009. Write a sentence explaining what it means. Compare it to the confidence interval in part c- do your findings make sense given what you know about the world?

MACRO DATA ATTACHED.

PLEASE INCLUDE ALL THE FORMULAS USED.