According to the U.S. Department of Justice, 25% of violent crimes involve the use of a weapon. We will assume that data file XR10109 contains a sample of the crime information for a given city, with data for the 400 crimes coded as 1 = crime involved a weapon and 2 = crime did not involve a weapon. Using the 0.05 level in a two-tail test, was the percentage of violent crimes involving a weapon in this city significantly different from the 25% in the nation as a whole? Identify and interpret the p-value for the test.
A computer and statistical software.