Question: When combining random variables X and Y, and This is true regardless of whether X and Y are independent. If the random variables are independent,

When combining random variables X and Y, and This is true regardless of whether X and Y are independent. If the random variables are independent, then it is also true that ; however, that relationship is not true if X and Y are not independent. Use the rules shown in the Key Idea box to determine the expected value and standard deviation of the difference between Todd's and Jill's scores (S = T - J). How does these values compare to the simulation results? How does SD(T - J) compare to SD(T + J)

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