Most_missed_concepts.ppt - Example1 Suppose that And that X and Y are independent Find Find x 2.5 x.4 y 1.2 y.6 x y and x y NEVER add\/subtract standard

Most_missed_concepts.ppt - Example1 Suppose that And that X...

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2 4 2 2 2 2 2 2 4 2 4 2 4 2(2.5) 4(1.2) .2 2 (.4) 4 (.6) 2.5298 x y x y x y x y 2 2 2 2.5 1.2 1.3 .4 .6 .7211 x y x y x y x y Example1: Suppose that And that X and Y are independent. Find: Find: NEVER add/subtract standard deviations, always add variances first then take the square to find St. Dev. 2.5, .4; 1.2, .6 x x y y x y x y and 2 4 2 4 x y x y and
When does X + X + X ≠ 3X? Answer: When doing random variable combinations! Example2: Suppose that on a given day the mean number of red lights you hit is 3 red lights and the standard deviation is 2 red lights. a) What would be the mean and standard deviation of the number of

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