1) Find the 2015 annual income statements for each of the four company: Amazon, Goldman Sachs, General Electric, AT&T by searching for the name of the employer plus the phrase "2015 annual income statement marketwatch." Marketwatch.com is a good option as the information is pretty clearly displayed there. Calculate the 2015 profit margin for each employer which is net income divided by sales/revenue, and also determine 2015 earnings per share which is the number in the EPS (Diluted) row.
2) Conduct no statistical analyses other than comparing the profit margins and earnings per share for the two unionized and two non-unionized employers. What do your data suggest about the relationship between unionization and profitability? What are some between-company differences other than unionization which could also account for your results?