To appropriately analyze and interpret data, you should: Select one: a. compare a data point (e.g. sales in September) to its previous value (e.g. sales in August) b. compare a data point (e.g. sales in September 2013) to its value in the previous year (e.g. sales in September 2012) c. only compare year-to-date data d. avoid paired comparisons and only present data in its proper historical context