1. For CONC_CHG
   1. Provide a thorough set of descriptive statistics describing the center and spread of the data including all the statistics we introduced in class. (10%)
   2. Create a histogram to describe these data (specify 1) that 10 bins should be used and 2) that either the frequency or percent of observations be displayed). Make sure you title and label your graph. (10%)
   3. Based on the above analyses, write 2-3 sentences describing the data and shape of the distribution.(10%)