find pivotal quantity
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In statistics, a pivotal quantity or pivot is a function of observations and unobservable parameters such that the function's probability distribution does not depend on the unknown parameters
Step-by-step explanation:
Suppose Y1,Y2,...,Yn denotes a random sample from a uniform distribution on the interval (−θ, 4θ), where θ>0 us an unknown parameter.
Assume that n is sufficiently large, find a pivotal quantity in terms of Y(with a bar on top) and θ.
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