answer

7. You hear a lot of talk about increasing global temperature, so you decide to see for yourself if there has been an actual change in recent years. You know that the average land temperature from 1951-1980 was 8.79 degrees Celsius. You find annual average temperature data from 1981-2017 and decide to construct a 99% confidence interval (because you want to be as sure as possible and look for differences in both directions, not just one) using this data to test for a difference from the previous average. Year Temp Year Temp Year Temp Year Temp 1981 9.301 1991 9.336 2001 9.542 2011 9.650 1982 8.788 1992 8.974 2002 9.695 2012 9.635 1983 9.173 1993 9.008 2003 9.649 2013 9.753 1984 8.824 1994 9.175 2004 9.451 2014 9.714 1985 8.799 1995 9.484 ' 2005 9.829 2015 9.962 1986 8.985 1996 9.168 2006 9.662 2016 10.160 1987 9.141 1997 9326 | 2007 9.876 2017 10.049 1988 9.345 1998 9.660 2008 9.581 1989 9.076 1999 9.406 2009 9.657 1990 9.378 2000 9.332 2010 9.828