Just to finish up from last time, we found that Arnie's posterior distribution was Normal(31.83,1.16^{2}). We calculate the Bayesian credible interval using values from Student's t table with df = 4. From wikipedia:

97.5% for df = 4 is 2.776

Compare this to the standard value of 1.96. There is a 95% probability that the true mean lies in the interval

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