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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This week (February 2015) in Missouri, the weather is going to be  cold and snowy. Most days will be in the 30s and 40s, but the  weekend will get a little bit warmer.  â¦ If this isn't the place or the week you wanted to know about,  please ask a question with more specifics, like where you are and  the dates you are asking about.