Show that the Bayes factor for a test of a point null hypothesis for the normal distribution
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Show that the Bayes factor for a test of a point null hypothesis for the normal distribution (where the prior under the alternative hypothesis is also normal) can be expanded in a power series in λ = ϕψ as
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B = λ exp(-2²){1 + ½ λ(z² + 1) + · · ·}.
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