In each of the two scenarios below, decide whether the argument and calculation are correct (though...

 

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In each of the two scenarios below, decide whether the argument and calculation are correct (though possibly incomplete) given the stated assumption. For those that you decide are correct, provide any missing details and fill in any gaps. For those that you decide are mistaken, point out at least one clear mistake and additionally highlight any obviously erroneous conclusions if there are any. (a) Assuming Fx(z) = {1-je-(-1) ifz 21 if x < 1 we calculate F(x)=e+ and so E[X] 1 Seda. [4] (b) Assuming fx,y (, y) = e -2x-y² = on 2 > 0, y € R, we get E[XY] = E[X]E[Y] = 0. [6] In each of the two scenarios below, decide whether the argument and calculation are correct (though possibly incomplete) given the stated assumption. For those that you decide are correct, provide any missing details and fill in any gaps. For those that you decide are mistaken, point out at least one clear mistake and additionally highlight any obviously erroneous conclusions if there are any. (a) Assuming Fx(z) = {1-je-(-1) ifz 21 if x < 1 we calculate F(x)=e+ and so E[X] 1 Seda. [4] (b) Assuming fx,y (, y) = e -2x-y² = on 2 > 0, y € R, we get E[XY] = E[X]E[Y] = 0. [6]

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