6.1: Show that if a random variable has a uniform density with the parameters α and β , the
Problem 6.1: Show that if a random variable has a uniform density with the parameters \(\alpha \) and \(\beta \), the probability that it’ll take on a value less that \(\alpha +p(\beta -\alpha )\) is equal to p .
Problem 6.16: If X has an exponential distribution, show that
\[\Pr \left( X\ge t+T|X\ge T \right)=\Pr \left( X\ge t \right)\]Problem 6.17: If X is a random variable having an exponential distribution with parameter \(\theta \), find the moment generating function of the random variable \(Y=X-\theta \).
Problem 6.2: Prove Theorem 6.1.
Problem 6.24: If the random variable T is the time of failure of a commercial product and the values of its probability density and distribution function at time t are \(f(t)\) and \(F(t)\), then its failure rate is given by
\[\frac{f(t)}{1-F(t)}\]- Show that if T has an exponential distribution, the failure rate is constant.
Problem 6.34: If X is a random variable having a normal distribution with the mean \(\mu \) and the standard deviation \(\sigma \), find the moment generating of \(Y=X-c\), where c is a constant, and use it to rework exercise 6.33
Problem 6.37: If X is a random variable having the standard normal distribution, and \(Y={{X}^{2}}\), show that \(\operatorname{cov}\left( X,Y \right)=0\) even though X and Y are evidently not independent.
Problem 6.41: Prove that if X is a random variable having the Poisson distribution with the parameter \(\lambda \), and \(\lambda \to \infty \), then the moment generating function of
\[Z=\frac{X-\lambda }{\sqrt{\lambda }}\]converges to the moment generating function of the standard normal distribution
Problem 6.48: If X and Y have a bivariate normal distribution and \(U=X+Y\) and \(V=X-Y\), find an expression for the correlation coefficient of U and V .
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