Given these assumptions, we know the following. 1  The expected value of the difference between all possible sample means is equal to the difference between population means. 2  Thus, E(x 1 - x 2) = Î¼ d = Î¼ 1 - Î¼ 2. 3  The standard deviation of the difference between sample means (Ï d) is approximately equal to:
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THE SPRINGFIELD MO CLIMATE NORMALS FOR TOMORROW NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 89 103 1984 MINIMUM TEMPERATURE (F) 67 50 1943 SUNRISE AND SUNSET AUGUST 17 2016........SUNRISE 632 AM CDT SUNSET 802 PM CDT AUGUST 18 2016........SUNRISE 633 AM CDT SUNSET 801 PM CDT - INDICATES NEGATIVE NUMBERS.