c h a p t e r 9 Hypothesis Testing Introduction Is global warming real? There is much evidence to suggest that temperatures have been increasing since the early part of the 20th century. Whether the increase is caused by human activity or whether it is part of a natural cycle is a topic of debate. Studies of global warming involve analyzing temperature records. The following table presents the record high and low temperatures in degrees Fahrenheit in Washington, D.C., along with the year in which the record was set, for a selection of days in April through September. The column labeled ‘‘More Recent’’ tells which record, high or low, occurred more recently. More More More Date High Year Low Year Recent Date High Year Low Year Recent Date High Year Low Year Recent Apr 2 89 1963 23 1907 High Jun 4 99 1925 46 1929∗ Low Aug 6 106 1918 53 1912 High 9 90 1959 28 1972∗ Low 11 101 1911 45 1913 Low 13 101 1881 55 1930∗ Low 16 92 2002 29 1928 High 18 97 1944 51 1965∗ Low 20 101 1983 50 1896 High 23 95 1960 33 1933∗ High 25 100 1997 53 1902 High 27 100 1987 51 1885 High 30 92 1942∗ 34 1874 High Jul 2 101 1898 55 1940 Low Sep 3 98 1953 48 1909∗ High May 7 95 1930 38 1970 Low 9 104 1936 55 1891 High 10 98 1983 44 1883 High 14 93 1956 41 1928 High 16 104 1988 56 1930∗ High 17 96 1991 44 1923 High 21 95 1934 41 1907 High 23 102 2011 56 1890 High 24 99 2010 39 1963 High 28 97 1941 42 1961 Low 30 99 1953 56 1914 High ∗Indicates that the record occurred more than once; only the most recent year is given. Source: National Weather Service 403
navidi_monk_elementary_statistics_2e_ch7-9
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