This exercise demonstrates that, in general, the results provided by Tchebysheffs
Chapter 3, Problem 3.169(choose chapter or problem)
This exercise demonstrates that, in general, the results provided by Tchebysheffs theorem cannot be improved upon. Let Y be a random variable such that p(1) = 1 18 , p(0) = 16 18 , p(1) = 1 18 .a Show that E(Y ) = 0 and V(Y ) = 1/9. b Use the probability distribution of Y to calculate P(|Y | 3). Compare this exact probability with the upper bound provided by Tchebysheffs theorem to see that the bound provided by Tchebysheffs theorem is actually attained when k = 3. *c In part (b) we guaranteed E(Y ) = 0 by placing all probability mass on the values 1, 0, and 1, with p(1) = p(1). The variance was controlled by the probabilities assigned to p(1) and p(1). Using this same basic idea, construct a probability distribution for a random variable X that will yield P(|X X | 2X ) = 1/4. *d If any k > 1 is specified, how can a random variable W be constructed so that P(|W W | kW ) = 1/k2 ?
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