Suppose that we take a different approach. We will find the median year of the observation period. The median of a data set is a value for which half of the values are below it, and half of the values are above it. In our case, the observation period consists of all of the years from 1871 to 2013. What is the median year? If there has not been a change in temperatures, then the average of the years in which a record high occurred should be close to the median year of the observation period since, under that assumption, the record high is equally likely to occur in any year. Find the mean of all 20 record high years from your sample. lCompare the average year of record highs to the median year from #5. Is the mean higher, lower, or approximately equal to the median year? Based on the comparison of your mean year of record highs to the median year of the observation period, does it seem likely that temperatures have been increasing, at least in Washington, D.C.? Explain