=+21. Walmart revenue. Each week about 100 million customers—nearly one-third of the U.S. population—visit one of Walmart’s U.S. stores. How does Walmart’s revenue relate to the state of the economy in general? Before 2009, Walmart reported sales each month, but since then it has switched to quarters. Here’s a regression table predicting Walmart’s monthly revenue ($Billion) from the end of 2003 through the start of 2007 from the consumer price index

(CPI), and a scatterplot of the relationship.

Dependent variable is: WM_Revenue R-squared = 11.4% R-squared (adjusted) = 9.0%

s = 3.689 with 39 - 2 = 37 degrees of freedom Variable Coeff SE(Coeff) t-ratio P-value Intercept -24.4085 19.25 -1.27 0.2127 CPI 0.071792 0.0330 2.18 0.0358