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The t statistic from comparing the first two columns of ice off data is 0 958 The IPCC would then conclude It is likely that by the year 1894 ice off date was earlier on Lake Mendota in Wisconsin Hypothesize how likelihood will change over time based on looking at the graph of ice off data Run the same analyses to test for differences in ice off date between section 1 and subsequent sections 1 vs 3 1 vs 4 etc Enter your results in this table T Stat Which comparison vs 2 1855 1874 vs 1875 1894 vs 3 1855 1874 vs 1895 1914 vs 4 1855 1874 vs 1915 1934 vs 5 1855 1874 vs 1935 1954 vs 6 1855 1874 vs 1955 1974 vs 7 1855 1874 vs 1975 1994 vs 8 1855 1874 vs 1995 2014 0 958 2 024 2 879 2 626 1 431 3 697 3 827 IPCC extremely likely virtually certain virtually certain very likely virtually certain virtually certain 1 Did the level of certainty change over time