Did you go to university? essay about students While statistics are recalculated and reported to the public each year, surveys, which take months to complete and cost millions of dollars, are conducted in each country only about once every five years. The gaps in data are filled in using statistical modeling. 必須 2000文字以内 [bbs:youtube:(Youtubeの動画ID)]と書くとYoutubeの動画が貼れます。(例:[bbs:youtube:OQThUAQ0UN0])