13. Pizza prices by city (Data in Pizza prices) The company that sells frozen pizza to stores in four markets in the United States (Denver, Baltimore, Dallas, and Chicago) wants to examine the prices that the stores charge for pizza slices. Here are boxplots comparing data from a sample of stores in each market: 3.5 3.0 HA Price 2.5 2.0 1.5 * Baltimore Dallas Chicago Denver Market a) Do prices appear to be the same in the four markets? Explain. b) Does the presence of any outliers affect your overall conclu sions about prices in the four markets