Consider the following two independent samples x1, . . , xm and y1, . . , yn selected from two exponential distributions with parameters λ1 and λ2. find c such that the distribution of c x¯ y¯ is f. what are the degrees of freedom?

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.