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Ellipse

Let be the bivariate normal pdf in expression (3.5.1). (a) Show that has an unique maximum at (b) For a given c > 0, show that the points of equal probability form an ellipse.

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The median lifetime

Twenty motors were put on test under a high-temperature setting. The lifetimes in hours of the motors under these conditions are given below. Also, the data are in the file lifetimemotor.rda at the site listed in the Preface. Suppose we assume that the lifetime of a motor under these conditions, X, has a Γ(1, θ)

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