In Next Steps: Cleaning Data, we noted that the z distribution is sometimes used to identify potential outliers in a data set. www.boxofficemojo.com provides data on U.S. box office receipts for major films. Here are domestic box office grosses for a randomly selected sample of 15 of the 100 top-grossing films of 2005. Note that we have rounded figures to the nearest million. The figures reported below are millions of dollars.