Suppose that you have grounds for believing that observations x i , y i for i =
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Suppose that you have grounds for believing that observations xi, yi for i = 1, 2 ... , n are such that xi ~ N(θ, ϕi ) and also yi ~ N(θ,ϕi ) but that you are not prepared to assume that the ϕi are equal. What statistic would you expect to base inferences about θ on?
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