Suppose that a friend concentrating in Environmental Science and Public Policy comes to you for some statistical consulting. He is working on an analysis using data collected at 200 locations across Europe and the continental United States in January of 2018 and January of 2008. Your friend proposes the following approach: for each location, conduct a two-sided hypothesis test at the α = 0.05 significance level to compare the mean temperature in January 2018 to the mean temperature in January 2008. He plans to conclude there is evidence of temperature warming for the locations at which mean temperature in January 2018 is significantly higher than mean temperature in January 2008, and specifically present only those significant results to his adviser.

Based on your knowledge of statistics, critique your friend’s analysis plan and provide specific advice for addressing any problems you identify. Limit your response to at most ten sentences.